diff --git a/src/NRedisStack.Core/Auxiliary.cs b/src/NRedisStack.Core/Auxiliary.cs
index 540aa8d1..2e4b53e5 100644
--- a/src/NRedisStack.Core/Auxiliary.cs
+++ b/src/NRedisStack.Core/Auxiliary.cs
@@ -4,7 +4,7 @@ namespace NRedisStack.Core
 {
     public static class Auxiliary
     {
-        public static List<object> MergeArgs(RedisKey key, RedisValue[] items)
+        public static List<object> MergeArgs(RedisKey key, params RedisValue[] items)
         {
             var args = new List<object> { key };
             foreach (var item in items) args.Add(item);
diff --git a/src/NRedisStack.Core/Bloom/BloomCommands.cs b/src/NRedisStack.Core/Bloom/BloomCommands.cs
index 21b1c845..a121a6e0 100644
--- a/src/NRedisStack.Core/Bloom/BloomCommands.cs
+++ b/src/NRedisStack.Core/Bloom/BloomCommands.cs
@@ -70,7 +70,7 @@ public async Task<bool> ExistsAsync(RedisKey key, RedisValue item)
         /// <param name="key">Name of the key to return information about.</param>
         /// <returns>Information of the filter.</returns>
         /// <remarks><seealso href="https://redis.io/commands/bf.info"/></remarks>
-        public BloomInformation? Info(RedisKey key)
+        public BloomInformation Info(RedisKey key)
         {
             var info = _db.Execute(BF.INFO, key);
             return ResponseParser.ToBloomInfo(info);
@@ -82,7 +82,7 @@ public async Task<bool> ExistsAsync(RedisKey key, RedisValue item)
         /// <param name="key">Name of the key to return information about.</param>
         /// <returns>Information of the filter.</returns>
         /// <remarks><seealso href="https://redis.io/commands/bf.info"/></remarks>
-        public async Task<BloomInformation?> InfoAsync(RedisKey key)
+        public async Task<BloomInformation> InfoAsync(RedisKey key)
         {
             var info = await _db.ExecuteAsync(BF.INFO, key);
             return ResponseParser.ToBloomInfo(info);
@@ -108,8 +108,8 @@ public async Task<bool> ExistsAsync(RedisKey key, RedisValue item)
                                   double? error = null, int? expansion = null,
                                   bool nocreate = false, bool nonscaling = false)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -119,6 +119,7 @@ public async Task<bool> ExistsAsync(RedisKey key, RedisValue item)
                 args.Add(capacity);
             }
 
+
             if (error != null)
             {
                 args.Add(BloomArgs.ERROR);
@@ -171,8 +172,8 @@ public async Task<bool> ExistsAsync(RedisKey key, RedisValue item)
                                   double? error = null, int? expansion = null,
                                   bool nocreate = false, bool nonscaling = false)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -221,11 +222,11 @@ public async Task<bool> ExistsAsync(RedisKey key, RedisValue item)
         /// <param name="key">Name of the key to restore.</param>
         /// <param name="iterator">Iterator value associated with data (returned by SCANDUMP).</param>
         /// <param name="data">Current data chunk (returned by SCANDUMP).</param>
-        /// <returns>Array with information of the filter.</returns>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/bf.loadchunk"/></remarks>
         public bool LoadChunk(RedisKey key, long iterator, Byte[] data)
         {
-            return ResponseParser.ParseOKtoBoolean(_db.Execute(BF.LOADCHUNK, key, iterator, data));
+            return ResponseParser.OKtoBoolean(_db.Execute(BF.LOADCHUNK, key, iterator, data));
         }
 
         /// <summary>
@@ -234,12 +235,12 @@ public bool LoadChunk(RedisKey key, long iterator, Byte[] data)
         /// <param name="key">Name of the key to restore.</param>
         /// <param name="iterator">Iterator value associated with data (returned by SCANDUMP).</param>
         /// <param name="data">Current data chunk (returned by SCANDUMP).</param>
-        /// <returns>Array with information of the filter.</returns>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/bf.loadchunk"/></remarks>
         public async Task<bool> LoadChunkAsync(RedisKey key, long iterator, Byte[] data)
         {
             var result = await _db.ExecuteAsync(BF.LOADCHUNK, key, iterator, data);
-            return ResponseParser.ParseOKtoBoolean(result);
+            return ResponseParser.OKtoBoolean(result);
         }
 
         /// <summary>
@@ -250,10 +251,10 @@ public async Task<bool> LoadChunkAsync(RedisKey key, long iterator, Byte[] data)
         /// <returns>An array of booleans. Each element is either true or false depending on whether the
         /// corresponding input element was newly added to the filter or may have previously existed.</returns>
         /// <remarks><seealso href="https://redis.io/commands/bf.madd"/></remarks>
-        public bool[] MAdd(RedisKey key, RedisValue[] items)
+        public bool[] MAdd(RedisKey key, params RedisValue[] items)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -273,10 +274,10 @@ public bool[] MAdd(RedisKey key, RedisValue[] items)
         /// <returns>An array of booleans. Each element is either true or false depending on whether the
         /// corresponding input element was newly added to the filter or may have previously existed.</returns>
         /// <remarks><seealso href="https://redis.io/commands/bf.madd"/></remarks>
-        public async Task<bool[]> MAddAsync(RedisKey key, RedisValue[] items)
+        public async Task<bool[]> MAddAsync(RedisKey key, params RedisValue[] items)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -299,8 +300,8 @@ public async Task<bool[]> MAddAsync(RedisKey key, RedisValue[] items)
         /// <remarks><seealso href="https://redis.io/commands/bf.mexists"/></remarks>
         public bool[] MExists(RedisKey key, RedisValue[] items)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -323,8 +324,8 @@ public bool[] MExists(RedisKey key, RedisValue[] items)
         /// <remarks><seealso href="https://redis.io/commands/bf.mexists"/></remarks>
         public async Task<bool[]> MExistsAsync(RedisKey key, RedisValue[] items)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -348,7 +349,7 @@ public async Task<bool[]> MExistsAsync(RedisKey key, RedisValue[] items)
         /// created in size of the last sub-filter multiplied by expansion.</param>
         /// <param name="nonscaling">(Optional) <see langword="true"/> toprevent the filter
         /// from creating additional sub-filters if initial capacity is reached.</param>
-        /// <returns><see langword="true"/> if executed correctly, <see langword="false"/> otherwise.</returns>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/bf.reserve"/></remarks>
         public bool Reserve(RedisKey key, double errorRate, long capacity,
                                    int? expansion = null, bool nonscaling = false)
@@ -365,7 +366,7 @@ public bool Reserve(RedisKey key, double errorRate, long capacity,
                 args.Add(BloomArgs.NONSCALING);
             }
 
-            return ResponseParser.ParseOKtoBoolean(_db.Execute(BF.RESERVE, args));
+            return ResponseParser.OKtoBoolean(_db.Execute(BF.RESERVE, args));
         }
 
         /// <summary>
@@ -378,7 +379,7 @@ public bool Reserve(RedisKey key, double errorRate, long capacity,
         /// created in size of the last sub-filter multiplied by expansion.</param>
         /// <param name="nonscaling">(Optional) <see langword="true"/> toprevent the filter
         /// from creating additional sub-filters if initial capacity is reached.</param>
-        /// <returns><see langword="true"/> if executed correctly, <see langword="false"/> otherwise.</returns>
+        /// <returns><see langword="true"/> if executed correctly, Error otherwise.</returns>
         /// <remarks><seealso href="https://redis.io/commands/bf.reserve"/></remarks>
         public async Task<bool> ReserveAsync(RedisKey key, double errorRate, long capacity,
                                    int? expansion = null, bool nonscaling = false)
@@ -396,7 +397,7 @@ public async Task<bool> ReserveAsync(RedisKey key, double errorRate, long capaci
             }
 
             var result = await _db.ExecuteAsync(BF.RESERVE, args);
-            return ResponseParser.ParseOKtoBoolean(result);
+            return ResponseParser.OKtoBoolean(result);
         }
 
         /// <summary>
@@ -406,7 +407,7 @@ public async Task<bool> ReserveAsync(RedisKey key, double errorRate, long capaci
         /// <param name="iterator">Iterator value; either 0 or the iterator from a previous invocation of this command.</param>
         /// <returns>Tuple of iterator and data.</returns>
         /// <remarks><seealso href="https://redis.io/commands/bf.scandump"/></remarks>
-        public Tuple<long,Byte[]>? ScanDump(RedisKey key, long iterator)
+        public Tuple<long,Byte[]> ScanDump(RedisKey key, long iterator)
         {
             return ResponseParser.ToScanDumpTuple(_db.Execute(BF.SCANDUMP, key, iterator));
         }
@@ -418,7 +419,7 @@ public async Task<bool> ReserveAsync(RedisKey key, double errorRate, long capaci
         /// <param name="iterator">Iterator value; either 0 or the iterator from a previous invocation of this command.</param>
         /// <returns>Tuple of iterator and data.</returns>
         /// <remarks><seealso href="https://redis.io/commands/bf.scandump"/></remarks>
-        public async Task<Tuple<long,Byte[]>?> ScanDumpAsync(RedisKey key, long iterator)
+        public async Task<Tuple<long,Byte[]>> ScanDumpAsync(RedisKey key, long iterator)
         {
             var result = await _db.ExecuteAsync(BF.SCANDUMP, key, iterator);
             return ResponseParser.ToScanDumpTuple(result);
diff --git a/src/NRedisStack.Core/CountMinSketch/CmsCommands.cs b/src/NRedisStack.Core/CountMinSketch/CmsCommands.cs
index d20ad077..4c5d42e6 100644
--- a/src/NRedisStack.Core/CountMinSketch/CmsCommands.cs
+++ b/src/NRedisStack.Core/CountMinSketch/CmsCommands.cs
@@ -47,7 +47,7 @@ public async Task<long> IncrByAsync(RedisKey key, RedisValue item, long incremen
         /// and the Amount by which the item counter is to be increased.</param>
         /// <returns>Count of each item after increment.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cms.incrby"/></remarks>
-        public long[]? IncrBy(RedisKey key, Tuple<RedisValue, long>[] itemIncrements)
+        public long[] IncrBy(RedisKey key, Tuple<RedisValue, long>[] itemIncrements)
         {
             if (itemIncrements.Length < 1)
                 throw new ArgumentException(nameof(itemIncrements));
@@ -69,7 +69,7 @@ public async Task<long> IncrByAsync(RedisKey key, RedisValue item, long incremen
         /// and the Amount by which the item counter is to be increased.</param>
         /// <returns>Count of each item after increment.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cms.incrby"/></remarks>
-        public async Task<long[]?> IncrByAsync(RedisKey key, Tuple<RedisValue, long>[] itemIncrements)
+        public async Task<long[]> IncrByAsync(RedisKey key, Tuple<RedisValue, long>[] itemIncrements)
         {
             if (itemIncrements.Length < 1)
                 throw new ArgumentException(nameof(itemIncrements));
@@ -91,7 +91,7 @@ public async Task<long> IncrByAsync(RedisKey key, RedisValue item, long incremen
         /// <param name="key">Name of the key to return information about.</param>
         /// <returns>Information of the sketch.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cms.info"/></remarks>
-        public CmsInformation? Info(RedisKey key)
+        public CmsInformation Info(RedisKey key)
         {
             var info = _db.Execute(CMS.INFO, key);
             return ResponseParser.ToCmsInfo(info);
@@ -103,13 +103,12 @@ public async Task<long> IncrByAsync(RedisKey key, RedisValue item, long incremen
         /// <param name="key">Name of the key to return information about.</param>
         /// <returns>Information of the sketch.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cms.info"/></remarks>
-        public async Task<CmsInformation?> InfoAsync(RedisKey key)
+        public async Task<CmsInformation> InfoAsync(RedisKey key)
         {
             var info = await _db.ExecuteAsync(CMS.INFO, key);
             return ResponseParser.ToCmsInfo(info);
         }
 
-        //TODO: functions that returns OK cannot return false, they return OK or ERROR. fix this (the Redis functions that can return also false - will return 1 for true ans 0 for false)
         /// <summary>
         /// Initializes a Count-Min Sketch to dimensions specified by user.
         /// </summary>
@@ -121,7 +120,7 @@ public async Task<long> IncrByAsync(RedisKey key, RedisValue item, long incremen
         /// <remarks><seealso href="https://redis.io/commands/cms.initbydim"/></remarks>
         public bool InitByDim(RedisKey key, long width, long depth)
         {
-            return ResponseParser.ParseOKtoBoolean(_db.Execute(CMS.INITBYDIM, key, width, depth));
+            return ResponseParser.OKtoBoolean(_db.Execute(CMS.INITBYDIM, key, width, depth));
         }
 
         /// <summary>
@@ -136,7 +135,7 @@ public bool InitByDim(RedisKey key, long width, long depth)
         public async Task<bool> InitByDimAsync(RedisKey key, long width, long depth)
         {
             var result = await _db.ExecuteAsync(CMS.INITBYDIM, key, width, depth);
-            return ResponseParser.ParseOKtoBoolean(result);
+            return ResponseParser.OKtoBoolean(result);
         }
 
         /// <summary>
@@ -149,7 +148,7 @@ public async Task<bool> InitByDimAsync(RedisKey key, long width, long depth)
         /// <remarks><seealso href="https://redis.io/commands/cms.initbyprob"/></remarks>
         public bool InitByProb(RedisKey key, double error, double probability)
         {
-            return ResponseParser.ParseOKtoBoolean(_db.Execute(CMS.INITBYPROB, key, error, probability));
+            return ResponseParser.OKtoBoolean(_db.Execute(CMS.INITBYPROB, key, error, probability));
         }
 
         /// <summary>
@@ -163,7 +162,7 @@ public bool InitByProb(RedisKey key, double error, double probability)
         public async Task<bool> InitByProbAsync(RedisKey key, double error, double probability)
         {
             var result = await _db.ExecuteAsync(CMS.INITBYPROB, key, error, probability);
-            return ResponseParser.ParseOKtoBoolean(result);
+            return ResponseParser.OKtoBoolean(result);
         }
 
         /// <summary>
@@ -178,7 +177,7 @@ public async Task<bool> InitByProbAsync(RedisKey key, double error, double proba
         public bool Merge(RedisValue destination, long numKeys, RedisValue[] source, long[]? weight = null)
         {
             if (source.Length < 1)
-                throw new ArgumentNullException(nameof(source));
+                throw new ArgumentOutOfRangeException(nameof(source));
 
             List<object> args = new List<object> { destination, numKeys };
 
@@ -190,7 +189,7 @@ public bool Merge(RedisValue destination, long numKeys, RedisValue[] source, lon
                 foreach (var w in weight) args.Add(w);
             }
 
-            return ResponseParser.ParseOKtoBoolean(_db.Execute(CMS.MERGE, args));
+            return ResponseParser.OKtoBoolean(_db.Execute(CMS.MERGE, args));
         }
 
         /// <summary>
@@ -205,7 +204,7 @@ public bool Merge(RedisValue destination, long numKeys, RedisValue[] source, lon
         public async Task<bool> MergeAsync(RedisValue destination, long numKeys, RedisValue[] source, long[]? weight = null)
         {
             if (source.Length < 1)
-                throw new ArgumentNullException(nameof(source));
+                throw new ArgumentOutOfRangeException(nameof(source));
 
             List<object> args = new List<object> { destination, numKeys };
 
@@ -218,7 +217,7 @@ public async Task<bool> MergeAsync(RedisValue destination, long numKeys, RedisVa
             }
 
             var result = await _db.ExecuteAsync(CMS.MERGE, args);
-            return ResponseParser.ParseOKtoBoolean(result);
+            return ResponseParser.OKtoBoolean(result);
         }
 
         /// <summary>
@@ -228,10 +227,10 @@ public async Task<bool> MergeAsync(RedisValue destination, long numKeys, RedisVa
         /// <param name="items">One or more items for which to return the count.</param>
         /// <returns>Array with a min-count of each of the items in the sketch</returns>
         /// <remarks><seealso href="https://redis.io/commands/cms.query"/></remarks>
-        public long[]? Query(RedisKey key, RedisValue[] items) //TODO: Create second version of this function using params for items input
+        public long[] Query(RedisKey key, params RedisValue[] items)
         {
             if (items.Length < 1)
-                throw new ArgumentNullException(nameof(items));
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
             foreach (var item in items) args.Add(item);
@@ -247,10 +246,10 @@ public async Task<bool> MergeAsync(RedisValue destination, long numKeys, RedisVa
         /// <param name="items">One or more items for which to return the count.</param>
         /// <returns>Array with a min-count of each of the items in the sketch</returns>
         /// <remarks><seealso href="https://redis.io/commands/cms.query"/></remarks>
-        public async Task<long[]?> QueryAsync(RedisKey key, RedisValue[] items) //TODO: Create second version of this function using params for items input
+        public async Task<long[]> QueryAsync(RedisKey key, params RedisValue[] items)
         {
             if (items.Length < 1)
-                throw new ArgumentNullException(nameof(items));
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
             foreach (var item in items) args.Add(item);
diff --git a/src/NRedisStack.Core/CuckooFilter/CuckooCommands.cs b/src/NRedisStack.Core/CuckooFilter/CuckooCommands.cs
index e6142a53..32300829 100644
--- a/src/NRedisStack.Core/CuckooFilter/CuckooCommands.cs
+++ b/src/NRedisStack.Core/CuckooFilter/CuckooCommands.cs
@@ -145,7 +145,7 @@ public async Task<bool> ExistsAsync(RedisKey key, RedisValue item)
         /// <param name="key">Name of the key to return information about.</param>
         /// <returns>Information of the filter.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cf.info"/></remarks>
-        public CuckooInformation? Info(RedisKey key)
+        public CuckooInformation Info(RedisKey key)
         {
             var info = _db.Execute(CF.INFO, key);
             return ResponseParser.ToCuckooInfo(info);
@@ -157,7 +157,7 @@ public async Task<bool> ExistsAsync(RedisKey key, RedisValue item)
         /// <param name="key">Name of the key to return information about.</param>
         /// <returns>Information of the filter.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cf.info"/></remarks>
-        public async Task<CuckooInformation?> InfoAsync(RedisKey key)
+        public async Task<CuckooInformation> InfoAsync(RedisKey key)
         {
             var info = await _db.ExecuteAsync(CF.INFO, key);
             return ResponseParser.ToCuckooInfo(info);
@@ -174,8 +174,8 @@ public async Task<bool> ExistsAsync(RedisKey key, RedisValue item)
         /// <remarks><seealso href="https://redis.io/commands/cf.insert"/></remarks>
         public bool[] Insert(RedisKey key, RedisValue[] items, int? capacity = null, bool nocreate = false)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -210,8 +210,8 @@ public bool[] Insert(RedisKey key, RedisValue[] items, int? capacity = null, boo
         /// <remarks><seealso href="https://redis.io/commands/cf.insert"/></remarks>
         public async Task<bool[]> InsertAsync(RedisKey key, RedisValue[] items, int? capacity = null, bool nocreate = false)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -249,8 +249,8 @@ public async Task<bool[]> InsertAsync(RedisKey key, RedisValue[] items, int? cap
         /// <remarks><seealso href="https://redis.io/commands/cf.insertnx"/></remarks>
         public bool[] InsertNX(RedisKey key, RedisValue[] items, int? capacity = null, bool nocreate = false)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -287,8 +287,8 @@ public bool[] InsertNX(RedisKey key, RedisValue[] items, int? capacity = null, b
         /// <remarks><seealso href="https://redis.io/commands/cf.insertnx"/></remarks>
         public async Task<bool[]> InsertNXAsync(RedisKey key, RedisValue[] items, int? capacity = null, bool nocreate = false)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -323,7 +323,7 @@ public async Task<bool[]> InsertNXAsync(RedisKey key, RedisValue[] items, int? c
         /// <remarks><seealso href="https://redis.io/commands/cf.loadchunk"/></remarks>
         public bool LoadChunk(RedisKey key, long iterator, Byte[] data)
         {
-            return ResponseParser.ParseOKtoBoolean(_db.Execute(CF.LOADCHUNK, key, iterator, data));
+            return ResponseParser.OKtoBoolean(_db.Execute(CF.LOADCHUNK, key, iterator, data));
         }
 
         /// <summary>
@@ -337,7 +337,7 @@ public bool LoadChunk(RedisKey key, long iterator, Byte[] data)
         public async Task<bool> LoadChunkAsync(RedisKey key, long iterator, Byte[] data)
         {
             var result = await _db.ExecuteAsync(CF.LOADCHUNK, key, iterator, data);
-            return ResponseParser.ParseOKtoBoolean(result);
+            return ResponseParser.OKtoBoolean(result);
         }
 
         /// <summary>
@@ -348,10 +348,10 @@ public async Task<bool> LoadChunkAsync(RedisKey key, long iterator, Byte[] data)
         /// <returns>An array of booleans, for each item <see langword="true"/> means the item may exist in the filter,
         /// and <see langword="false"/> means the item may exist in the filter.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cf.mexists"/></remarks>
-        public bool[] MExists(RedisKey key, RedisValue[] items)
+        public bool[] MExists(RedisKey key, params RedisValue[] items)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -371,10 +371,10 @@ public bool[] MExists(RedisKey key, RedisValue[] items)
         /// <returns>An array of booleans, for each item <see langword="true"/> means the item may exist in the filter,
         /// and <see langword="false"/> means the item may exist in the filter.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cf.mexists"/></remarks>
-        public async Task<bool[]> MExistsAsync(RedisKey key, RedisValue[] items)
+        public async Task<bool[]> MExistsAsync(RedisKey key, params RedisValue[] items)
         {
-            if (items == null)
-                throw new ArgumentNullException(nameof(items));
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             List<object> args = new List<object> { key };
 
@@ -397,7 +397,7 @@ public async Task<bool[]> MExistsAsync(RedisKey key, RedisValue[] items)
         /// declaring filter as full and creating an additional filter.</param>
         /// <param name="expansion">(Optional) When capacity is reached, an additional sub-filter is
         /// created in size of the last sub-filter multiplied by expansion.</param>
-        /// <returns><see langword="true"/> if executed correctly, <see langword="false"/> otherwise.</returns>
+        /// <returns><see langword="true"/> if executed correctly, Error otherwise.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cf.reserve"/></remarks>
         public bool Reserve(RedisKey key, long capacity,
                                    long? bucketSize = null, int? maxIterations = null, int? expansion = null)
@@ -422,7 +422,7 @@ public bool Reserve(RedisKey key, long capacity,
                 args.Add(expansion);
             }
 
-            return ResponseParser.ParseOKtoBoolean(_db.Execute(CF.RESERVE, args));
+            return ResponseParser.OKtoBoolean(_db.Execute(CF.RESERVE, args));
         }
 
         /// <summary>
@@ -435,7 +435,7 @@ public bool Reserve(RedisKey key, long capacity,
         /// declaring filter as full and creating an additional filter.</param>
         /// <param name="expansion">(Optional) When capacity is reached, an additional sub-filter is
         /// created in size of the last sub-filter multiplied by expansion.</param>
-        /// <returns><see langword="true"/> if executed correctly, <see langword="false"/> otherwise.</returns>
+        /// <returns><see langword="true"/> if executed correctly, Error otherwise.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cf.reserve"/></remarks>
         public async Task<bool> ReserveAsync(RedisKey key, long capacity,
                                    long? bucketSize = null, int? maxIterations = null, int? expansion = null)
@@ -461,7 +461,7 @@ public async Task<bool> ReserveAsync(RedisKey key, long capacity,
             }
 
             var result = await _db.ExecuteAsync(CF.RESERVE, args);
-            return ResponseParser.ParseOKtoBoolean(result);
+            return ResponseParser.OKtoBoolean(result);
         }
 
         /// <summary>
@@ -471,7 +471,7 @@ public async Task<bool> ReserveAsync(RedisKey key, long capacity,
         /// <param name="iterator">Iterator value; either 0 or the iterator from a previous invocation of this command.</param>
         /// <returns>Tuple of iterator and data.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cf.scandump"/></remarks>
-        public Tuple<long,Byte[]>? ScanDump(RedisKey key, long iterator)
+        public Tuple<long,Byte[]> ScanDump(RedisKey key, long iterator)
         {
             return ResponseParser.ToScanDumpTuple(_db.Execute(CF.SCANDUMP, key, iterator));
         }
@@ -483,7 +483,7 @@ public async Task<bool> ReserveAsync(RedisKey key, long capacity,
         /// <param name="iterator">Iterator value; either 0 or the iterator from a previous invocation of this command.</param>
         /// <returns>Tuple of iterator and data.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cf.scandump"/></remarks>
-        public async Task<Tuple<long,Byte[]>?> ScanDumpAsync(RedisKey key, long iterator)
+        public async Task<Tuple<long,Byte[]>> ScanDumpAsync(RedisKey key, long iterator)
         {
             var result = await _db.ExecuteAsync(CF.SCANDUMP, key, iterator);
             return ResponseParser.ToScanDumpTuple(result);
diff --git a/src/NRedisStack.Core/ResponseParser.cs b/src/NRedisStack.Core/ResponseParser.cs
index 3b98cff3..9f5adf07 100644
--- a/src/NRedisStack.Core/ResponseParser.cs
+++ b/src/NRedisStack.Core/ResponseParser.cs
@@ -8,21 +8,21 @@
 using NRedisStack.Core.CuckooFilter.DataTypes;
 using NRedisStack.Core.CountMinSketch.DataTypes;
 using NRedisStack.Core.TopK.DataTypes;
+using NRedisStack.Core.Tdigest.DataTypes;
 
 namespace NRedisStack.Core
 {
     public static class ResponseParser
     {
-
-        //TODO: See if I can change the code to remove the warnings
-        public static bool ParseOKtoBoolean(RedisResult result)
+        public static bool OKtoBoolean(RedisResult result)
         {
             return result.ToString() == "OK";
         }
 
         public static bool[] ToBooleanArray(RedisResult result)
         {
-            RedisResult[] redisResults = (RedisResult[])result;
+            RedisResult[]? redisResults = ToArray(result);
+
             bool[] boolArr = new bool[redisResults.Length];
             for (int i = 0; i < redisResults.Length; i++)
             {
@@ -32,21 +32,50 @@ public static bool[] ToBooleanArray(RedisResult result)
             return boolArr;
         }
 
-        public static RedisResult[]? ToArray(RedisResult result)
+        public static RedisResult[] ToArray(RedisResult result)
         {
-            return (RedisResult[]?)result;
+            var redisResults = (RedisResult[]?)result;
+            if(redisResults != null)
+                return redisResults;
+            throw new ArgumentNullException(nameof(redisResults));
+
+
         }
 
         public static long ToLong(RedisResult result)
         {
-            if (result.Type == ResultType.None) return 0;
-            return (long)result;
+            if((long?) result == null)
+                throw new ArgumentNullException(nameof(result));
+            return (long) result;
         }
 
-        public static long[]? ToLongArray(RedisResult result)
+        public static double ToDouble(RedisResult result)
         {
-            if (result.Type == ResultType.None) return null;
-            return (long[])result;
+            if((double?) result == null)
+                throw new ArgumentNullException(nameof(result));
+            return (double) result;
+        }
+
+        public static double[] ToDoubleArray(RedisResult result)
+        {
+            List<double> redisResults = new List<double>();
+            foreach(var res in ToArray(result))
+            {
+                redisResults.Add(ToDouble(res));
+            }
+
+            return redisResults.ToArray();
+        }
+
+        public static long[] ToLongArray(RedisResult result)
+        {
+            List<long> redisResults = new List<long>();
+            foreach(var res in ToArray(result))
+            {
+                redisResults.Add(ToLong(res));
+            }
+
+            return redisResults.ToArray();
         }
 
         public static TimeStamp ToTimeStamp(RedisResult result)
@@ -66,35 +95,36 @@ public static IReadOnlyList<TimeStamp> ToTimeStampArray(RedisResult result)
 
         public static TimeSeriesTuple? ToTimeSeriesTuple(RedisResult result)
         {
-            RedisResult[]? redisResults = (RedisResult[]?)result;
+            RedisResult[] redisResults = ToArray(result);
             if (redisResults.Length == 0) return null;
             return new TimeSeriesTuple(ToTimeStamp(redisResults[0]), (double)redisResults[1]);
         }
 
-        public static Tuple<long, Byte[]>? ToScanDumpTuple(RedisResult result)
+        public static Tuple<long, Byte[]> ToScanDumpTuple(RedisResult result)
         {
-            RedisResult[]? redisResults = (RedisResult[]?)result;
+            RedisResult[] redisResults = ToArray(result);
             if (redisResults == null || redisResults.Length == 0) return null;
             return new Tuple<long, Byte[]>((long)redisResults[0], (Byte[])redisResults[1]);
         }
 
-        public static HashEntry? ToHashEntry(RedisResult result)
+        public static HashEntry ToHashEntry(RedisResult result)
         {
-            RedisValue[]? redisResults = (RedisValue[]?)result;
-            if (redisResults.Length == 0) return null;
-            return new HashEntry(redisResults[0], redisResults[1]);
+            RedisResult[] redisResults = ToArray(result);
+            if (redisResults.Length < 2)
+                throw new ArgumentOutOfRangeException(nameof(result));
 
+            return new HashEntry((RedisValue)(redisResults[0]), ((RedisValue)redisResults[1]));
         }
 
-        public static HashEntry[]? ToHashEntryArray(RedisResult result)
+        public static HashEntry[] ToHashEntryArray(RedisResult result)
         {
-            RedisValue[]? redisResults = (RedisValue[]?)result;
+            RedisResult[] redisResults = ToArray(result);
 
             var hash = new HashEntry[redisResults.Length / 2];
             if (redisResults.Length == 0) return hash;
 
             for (int i = 0; i < redisResults.Length - 1; i += 2)
-                hash[i / 2] = new HashEntry(redisResults[i], redisResults[i + 1]);
+                hash[i / 2] = new HashEntry(((RedisValue)redisResults[i]), ((RedisValue)redisResults[i + 1]));
             return hash;
         }
 
@@ -181,13 +211,11 @@ public static IReadOnlyList<TimeSeriesRule> ToRuleArray(RedisResult result)
             return DuplicatePolicyExtensions.AsPolicy(policyStatus.ToUpper());
         }
 
-        public static BloomInformation? ToBloomInfo(RedisResult result) //TODO: Think about a different implementation, because if the output of BF.INFO changes or even just the names of the labels then the parsing will not work
+        public static BloomInformation ToBloomInfo(RedisResult result) //TODO: Think about a different implementation, because if the output of BF.INFO changes or even just the names of the labels then the parsing will not work
         {
             long capacity, size, numberOfFilters, numberOfItemsInserted, expansionRate;
             capacity = size = numberOfFilters = numberOfItemsInserted = expansionRate = -1;
-            RedisResult[]? redisResults = (RedisResult[]?)result;
-
-            if (redisResults == null) return null;
+            RedisResult[] redisResults = ToArray(result);
 
             for (int i = 0; i < redisResults.Length; ++i)
             {
@@ -215,7 +243,7 @@ public static IReadOnlyList<TimeSeriesRule> ToRuleArray(RedisResult result)
             return new BloomInformation(capacity, size, numberOfFilters, numberOfItemsInserted, expansionRate);
         }
 
-        public static CuckooInformation? ToCuckooInfo(RedisResult result) //TODO: Think about a different implementation, because if the output of BF.INFO changes or even just the names of the labels then the parsing will not work
+        public static CuckooInformation ToCuckooInfo(RedisResult result) //TODO: Think about a different implementation, because if the output of BF.INFO changes or even just the names of the labels then the parsing will not work
         {
             long size, numberOfBuckets, numberOfFilter, numberOfItemsInserted,
                  numberOfItemsDeleted, bucketSize, expansionRate, maxIteration;
@@ -224,9 +252,7 @@ public static IReadOnlyList<TimeSeriesRule> ToRuleArray(RedisResult result)
             numberOfItemsInserted = numberOfItemsDeleted =
             bucketSize = expansionRate = maxIteration = -1;
 
-            RedisResult[]? redisResults = (RedisResult[]?)result;
-
-            if (redisResults == null) return null;
+            RedisResult[] redisResults = ToArray(result);
 
             for (int i = 0; i < redisResults.Length; ++i)
             {
@@ -265,15 +291,13 @@ public static IReadOnlyList<TimeSeriesRule> ToRuleArray(RedisResult result)
                                         numberOfItemsDeleted, bucketSize, expansionRate, maxIteration);
         }
 
-        public static CmsInformation? ToCmsInfo(RedisResult result) //TODO: Think about a different implementation, because if the output of CMS.INFO changes or even just the names of the labels then the parsing will not work
+        public static CmsInformation ToCmsInfo(RedisResult result) //TODO: Think about a different implementation, because if the output of CMS.INFO changes or even just the names of the labels then the parsing will not work
         {
             long width, depth, count;
 
             width = depth = count = -1;
 
-            RedisResult[]? redisResults = (RedisResult[]?)result;
-
-            if (redisResults == null) return null;
+            RedisResult[] redisResults = ToArray(result);
 
             for (int i = 0; i < redisResults.Length; ++i)
             {
@@ -296,7 +320,7 @@ public static IReadOnlyList<TimeSeriesRule> ToRuleArray(RedisResult result)
             return new CmsInformation(width, depth, count);
         }
 
-        public static TopKInformation? ToTopKInfo(RedisResult result) //TODO: Think about a different implementation, because if the output of CMS.INFO changes or even just the names of the labels then the parsing will not work
+        public static TopKInformation ToTopKInfo(RedisResult result) //TODO: Think about a different implementation, because if the output of CMS.INFO changes or even just the names of the labels then the parsing will not work
         {
             long k, width, depth;
             double decay;
@@ -304,9 +328,7 @@ public static IReadOnlyList<TimeSeriesRule> ToRuleArray(RedisResult result)
             k = width = depth = -1;
             decay = -1.0;
 
-            RedisResult[]? redisResults = (RedisResult[]?)result;
-
-            if (redisResults == null) return null;
+            RedisResult[] redisResults = ToArray(result);
 
             for (int i = 0; i < redisResults.Length; ++i)
             {
@@ -332,6 +354,50 @@ public static IReadOnlyList<TimeSeriesRule> ToRuleArray(RedisResult result)
             return new TopKInformation(k, width, depth, decay);
         }
 
+        public static TdigestInformation ToTdigestInfo(RedisResult result) //TODO: Think about a different implementation, because if the output of CMS.INFO changes or even just the names of the labels then the parsing will not work
+        {
+            long compression, capacity, mergedNodes, unmergedNodes, totalCompressions;
+            string? mergedWeight, unmergedWeight;
+
+            compression = capacity = mergedNodes = unmergedNodes = totalCompressions = -1;
+            mergedWeight = unmergedWeight = "";
+
+            RedisResult[] redisResults = ToArray(result);
+
+            for (int i = 0; i < redisResults.Length; ++i)
+            {
+                string? label = redisResults[i++].ToString();
+
+                switch (label)
+                {
+                    case "Compression":
+                        compression = (long)redisResults[i];
+                        break;
+                    case "Capacity":
+                        capacity = (long)redisResults[i];
+                        break;
+                    case "Merged nodes":
+                        mergedNodes = (long)redisResults[i];
+                        break;
+                    case "Unmerged nodes":
+                        unmergedNodes = (long)redisResults[i];
+                        break;
+                    case "Merged weight":
+                        mergedWeight = redisResults[i].ToString();
+                        break;
+                    case "Unmerged weight":
+                        unmergedWeight = redisResults[i].ToString();
+                        break;
+                    case "Total compressions":
+                        totalCompressions = (long)redisResults[i];
+                        break;
+                }
+            }
+
+            return new TdigestInformation(compression, capacity, mergedNodes, unmergedNodes,
+                                          mergedWeight, unmergedWeight, totalCompressions);
+        }
+
         public static TimeSeriesInformation ToTimeSeriesInfo(RedisResult result)
         {
             long totalSamples = -1, memoryUsage = -1, retentionTime = -1, chunkSize = -1, chunkCount = -1;
@@ -392,9 +458,10 @@ public static TimeSeriesInformation ToTimeSeriesInfo(RedisResult result)
             lastTimestamp, retentionTime, chunkCount, chunkSize, labels, sourceKey, rules, duplicatePolicy);
         }
 
-        public static IReadOnlyList<string> ToStringArray(RedisResult result)
+        public static IReadOnlyList<string>? ToStringArray(RedisResult result)
         {
-            RedisResult[] redisResults = (RedisResult[])result;
+            RedisResult[] redisResults = ToArray(result);
+
             var list = new List<string>();
             if (redisResults.Length == 0) return list;
             Array.ForEach(redisResults, str => list.Add((string)str));
diff --git a/src/NRedisStack.Core/Tdigest/DataTypes/TdigestInformation.cs b/src/NRedisStack.Core/Tdigest/DataTypes/TdigestInformation.cs
new file mode 100644
index 00000000..c51142a7
--- /dev/null
+++ b/src/NRedisStack.Core/Tdigest/DataTypes/TdigestInformation.cs
@@ -0,0 +1,31 @@
+namespace NRedisStack.Core.Tdigest.DataTypes
+{
+    /// <summary>
+    /// This class represents the response for TDIGEST.INFO command.
+    /// This object has Read-only properties and cannot be generated outside a TDIGEST.INFO response.
+    /// </summary>
+    public class TdigestInformation
+    {
+        public long Compression { get; private set; }
+        public long Capacity { get; private set; }
+        public long MergedNodes { get; private set; }
+        public long UnmergedNodes { get; private set; }
+        public string MergedWeight { get; private set; }
+        public string UnmergedWeight { get; private set; }
+        public long TotalCompressions { get; private set; }
+
+
+        internal TdigestInformation(long compression, long capacity, long mergedNodes,
+                                    long unmergedNodes, string mergedWeight,
+                                    string unmergedWeight, long totalCompressions)
+        {
+            Compression = compression;
+            Capacity = capacity;
+            MergedNodes = mergedNodes;
+            UnmergedNodes = unmergedNodes;
+            MergedWeight = mergedWeight;
+            UnmergedWeight = unmergedWeight;
+            TotalCompressions = totalCompressions;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/NRedisStack.Core/Tdigest/Literals/CommandArgs.cs b/src/NRedisStack.Core/Tdigest/Literals/CommandArgs.cs
new file mode 100644
index 00000000..14e37bbf
--- /dev/null
+++ b/src/NRedisStack.Core/Tdigest/Literals/CommandArgs.cs
@@ -0,0 +1,7 @@
+namespace NRedisStack.Core.Literals
+{
+    internal class TdigestArgs
+    {
+        public static string COMPRESSION => "COMPRESSION";
+    }
+}
\ No newline at end of file
diff --git a/src/NRedisStack.Core/Tdigest/Literals/Commands.cs b/src/NRedisStack.Core/Tdigest/Literals/Commands.cs
new file mode 100644
index 00000000..d4633f3c
--- /dev/null
+++ b/src/NRedisStack.Core/Tdigest/Literals/Commands.cs
@@ -0,0 +1,17 @@
+namespace NRedisStack.Core.Literals
+{
+    internal class TDIGEST
+    {
+        public static string CREATE => "TDIGEST.CREATE";
+        public static string RESET => "TDIGEST.RESET";
+        public static string ADD => "TDIGEST.ADD";
+        public static string MERGE => "TDIGEST.MERGE";
+        public static string MERGESTORE => "TDIGEST.MERGESTORE";
+        public static string MIN => "TDIGEST.MIN";
+        public static string MAX => "TDIGEST.MAX";
+        public static string QUANTILE => "TDIGEST.QUANTILE";
+        public static string CDF => "TDIGEST.CDF";
+        public static string TRIMMED_MEAN => "TDIGEST.TRIMMED_MEAN";
+        public static string INFO => "TDIGEST.INFO";
+    }
+}
\ No newline at end of file
diff --git a/src/NRedisStack.Core/Tdigest/TdigestCommands.cs b/src/NRedisStack.Core/Tdigest/TdigestCommands.cs
new file mode 100644
index 00000000..be77ff2a
--- /dev/null
+++ b/src/NRedisStack.Core/Tdigest/TdigestCommands.cs
@@ -0,0 +1,402 @@
+using NRedisStack.Core.Tdigest.DataTypes;
+using NRedisStack.Core.Literals;
+using StackExchange.Redis;
+namespace NRedisStack.Core
+{
+
+    public class TdigestCommands
+    {
+        IDatabase _db;
+        public TdigestCommands(IDatabase db)
+        {
+            _db = db;
+        }
+
+        /// <summary>
+        /// Adds one or more observations to a t-digest sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <param name="value">The value of the observation.</param>
+        /// <param name="weight">The weight of this observation.</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.add"/></remarks>
+        public bool Add(RedisKey key, double item, double weight)
+        {
+            if (weight < 0) throw new ArgumentException(nameof(weight));
+
+            return ResponseParser.OKtoBoolean(_db.Execute(TDIGEST.ADD, key, item, weight));
+        }
+
+        /// <summary>
+        /// Adds one or more observations to a t-digest sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <param name="value">The value of the observation.</param>
+        /// <param name="weight">The weight of this observation.</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.add"/></remarks>
+        public async Task<bool> AddAsync(RedisKey key, double item, double weight)
+        {
+            if (weight < 0) throw new ArgumentException(nameof(weight));
+
+            var result = await _db.ExecuteAsync(TDIGEST.ADD, key, item);
+            return ResponseParser.OKtoBoolean(result);
+        }
+
+        /// <summary>
+        /// Adds one or more observations to a t-digest sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <param name="valueWeight">Tuple of the value of the observation and The weight of this observation.</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.add"/></remarks>
+        public bool Add(RedisKey key, Tuple<double, double>[] valueWeight)
+        {
+            var args = new List<object> { key };
+
+            foreach (var pair in valueWeight)
+            {
+                if (pair.Item2 < 0) throw new ArgumentException(nameof(pair.Item2));
+                args.Add(pair.Item1);
+                args.Add(pair.Item2);
+            }
+            return ResponseParser.OKtoBoolean(_db.Execute(TDIGEST.ADD, args));
+        }
+
+        /// <summary>
+        /// Adds one or more observations to a t-digest sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <param name="valueWeight">Tuple of the value of the observation and The weight of this observation.</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.add"/></remarks>
+        public async Task<bool> AddAsync(RedisKey key, Tuple<double, double>[] valueWeight)
+        {
+            var args = new List<object> { key };
+
+            foreach (var pair in valueWeight)
+            {
+                if (pair.Item2 < 0) throw new ArgumentException(nameof(pair.Item2));
+                args.Add(pair.Item1);
+                args.Add(pair.Item2);
+            }
+            return ResponseParser.OKtoBoolean(await _db.ExecuteAsync(TDIGEST.ADD, args));
+        }
+
+        /// <summary>
+        /// Estimate the fraction of all observations added which are <= value.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <param name="value">upper limit of observation value.</param>
+        /// <returns>double-reply - estimation of the fraction of all observations added which are <= value</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.cdf"/></remarks>
+        public double CDF(RedisKey key, double item)
+        {
+            return ResponseParser.ToDouble(_db.Execute(TDIGEST.ADD, key, item));
+        }
+
+        /// <summary>
+        /// Estimate the fraction of all observations added which are <= value.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <param name="value">upper limit of observation value.</param>
+        /// <returns>double-reply - estimation of the fraction of all observations added which are <= value</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.cdf"/></remarks>
+        public async Task<double> CDF(RedisKey key, double item, double weight)
+        {
+            var result = await _db.ExecuteAsync(TDIGEST.ADD, key, item);
+            return ResponseParser.ToDouble(result);
+        }
+
+        /// <summary>
+        /// Allocate memory and initialize a t-digest sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <param name="compression">The compression parameter.</param>
+        /// <returns>double-reply - estimation of the fraction of all observations added which are <= value</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.create"/></remarks>
+        public double Create(RedisKey key, long compression = 100)
+        {
+            return ResponseParser.ToDouble(_db.Execute(TDIGEST.CREATE, key, compression));
+        }
+
+        /// <summary>
+        /// Allocate memory and initialize a t-digest sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <param name="compression">The compression parameter.</param>
+        /// <returns>double-reply - estimation of the fraction of all observations added which are <= value</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.create"/></remarks>
+        public async Task<double> CreateAsync(RedisKey key, long compression = 100)
+        {
+            return ResponseParser.ToDouble(await _db.ExecuteAsync(TDIGEST.CREATE, key, compression));
+        }
+
+        /// <summary>
+        /// Returns information about a sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <returns>information about a sketch</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.info"/></remarks>
+        public TdigestInformation Info(RedisKey key)
+        {
+            return ResponseParser.ToTdigestInfo(_db.Execute(TDIGEST.INFO, key));
+        }
+
+        /// <summary>
+        /// Returns information about a sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <returns>information about a sketch</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.info"/></remarks>
+        public async Task<TdigestInformation> InfoAsync(RedisKey key)
+        {
+            return ResponseParser.ToTdigestInfo(await _db.ExecuteAsync(TDIGEST.INFO, key));
+        }
+
+
+        /// <summary>
+        /// Get the maximum observation value from the sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <returns>the maximum observation value from the sketch</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.max"/></remarks>
+        public RedisResult Max(RedisKey key)
+        {
+            return _db.Execute(TDIGEST.MAX, key);
+        }
+
+        /// <summary>
+        /// Get the maximum observation value from the sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <returns>the maximum observation value from the sketch</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.max"/></remarks>
+        public async Task<RedisResult> MaxAsync(RedisKey key)
+        {
+            return await _db.ExecuteAsync(TDIGEST.MAX, key);
+        }
+
+        /// <summary>
+        /// Get the minimum observation value from the sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <returns>the minimum observation value from the sketch</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.min"/></remarks>
+        public RedisResult Min(RedisKey key)
+        {
+            return _db.Execute(TDIGEST.MIN, key);
+        }
+
+        /// <summary>
+        /// Get the minimum observation value from the sketch.
+        /// </summary>
+        /// <param name="key">The name of the sketch.</param>
+        /// <returns>the minimum observation value from the sketch</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.min"/></remarks>
+        public async Task<RedisResult> MinAsync(RedisKey key)
+        {
+            return await _db.ExecuteAsync(TDIGEST.MIN, key);
+        }
+
+        /// <summary>
+        /// Get the minimum observation value from the sketch.
+        /// </summary>
+        /// <param name="destinationKey">TSketch to copy observation values to (a t-digest data structure).</param>
+        /// <param name="sourceKey">Sketch to copy observation values from (a t-digest data structure).</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.merge"/></remarks>
+        public bool Merge(RedisKey destinationKey, RedisKey sourceKey)
+        {
+            return ResponseParser.OKtoBoolean(_db.Execute(TDIGEST.MERGE, destinationKey, sourceKey));
+        }
+
+        /// <summary>
+        /// Get the minimum observation value from the sketch.
+        /// </summary>
+        /// <param name="destinationKey">TSketch to copy observation values to (a t-digest data structure).</param>
+        /// <param name="sourceKey">Sketch to copy observation values from (a t-digest data structure).</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.merge"/></remarks>
+        public async Task<bool> MergeAsync(RedisKey destinationKey, RedisKey sourceKey)
+        {
+            var result = await _db.ExecuteAsync(TDIGEST.MERGE, destinationKey, sourceKey);
+            return ResponseParser.OKtoBoolean(result);
+        }
+
+        /// <summary>
+        /// Get the minimum observation value from the sketch.
+        /// </summary>
+        /// <param name="destinationKey">TSketch to copy observation values to (a t-digest data structure).</param>
+        /// <param name="sourceKeys">Sketch to copy observation values from (a t-digest data structure).</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.merge"/></remarks>
+        public bool Merge(RedisKey destinationKey, params RedisKey[] sourceKeys)
+        {
+            if (sourceKeys.Length < 1) throw new ArgumentException(nameof(sourceKeys));
+
+            var args = sourceKeys.ToList();
+            args.Insert(0, destinationKey);
+
+            return ResponseParser.OKtoBoolean(_db.Execute(TDIGEST.MERGE, args));
+        }
+
+        /// <summary>
+        /// Get the minimum observation value from the sketch.
+        /// </summary>
+        /// <param name="destinationKey">TSketch to copy observation values to (a t-digest data structure).</param>
+        /// <param name="sourceKeys">Sketch to copy observation values from (a t-digest data structure).</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.merge"/></remarks>
+        public async Task<bool> MergeAsync(RedisKey destinationKey, params RedisKey[] sourceKeys)
+        {
+            if (sourceKeys.Length < 1) throw new ArgumentException(nameof(sourceKeys));
+
+            var args = sourceKeys.ToList();
+            args.Insert(0, destinationKey);
+
+            var result = await _db.ExecuteAsync(TDIGEST.MERGE, args);
+            return ResponseParser.OKtoBoolean(result);
+        }
+
+        /// <summary>
+        /// Merges all of the values from 'from' keys to 'destination-key' sketch.
+        /// </summary>
+        /// <param name="destinationKey">TSketch to copy observation values to (a t-digest data structure).</param>
+        /// <param name="numkeys">Number of sketch(es) to copy observation values from.</param>
+        /// <param name="compression">The compression parameter.</param>
+        /// <param name="sourceKeys">Sketch to copy observation values from (a t-digest data structure).</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.mergestore"/></remarks>
+        public bool MergeStore(RedisKey destinationKey, long numkeys, long compression = 100, params RedisKey[] sourceKeys)
+        {
+            if (sourceKeys.Length < 1) throw new ArgumentException(nameof(sourceKeys));
+
+            var args = new List<object> { destinationKey, numkeys };
+            foreach (var key in sourceKeys) args.Add(key);
+            args.Add(TdigestArgs.COMPRESSION);
+            args.Add(compression);
+
+            return ResponseParser.OKtoBoolean(_db.Execute(TDIGEST.MERGE, args));
+        }
+
+        /// <summary>
+        /// Merges all of the values from 'from' keys to 'destination-key' sketch.
+        /// </summary>
+        /// <param name="destinationKey">TSketch to copy observation values to (a t-digest data structure).</param>
+        /// <param name="numkeys">Number of sketch(es) to copy observation values from.</param>
+        /// <param name="compression">The compression parameter.</param>
+        /// <param name="sourceKeys">Sketch to copy observation values from (a t-digest data structure).</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.mergestore"/></remarks>
+        public async Task<bool> MergeStoreAsync(RedisKey destinationKey, long numkeys, long compression = 100, params RedisKey[] sourceKeys)
+        {
+            if (sourceKeys.Length < 1) throw new ArgumentException(nameof(sourceKeys));
+
+            var args = new List<object> { destinationKey, numkeys };
+            foreach (var key in sourceKeys) args.Add(key);
+            args.Add(TdigestArgs.COMPRESSION);
+            args.Add(compression);
+
+            var result = await _db.ExecuteAsync(TDIGEST.MERGE, args);
+            return ResponseParser.OKtoBoolean(result);
+        }
+
+        /// <summary>
+        /// Returns estimates of one or more cutoffs such that a specified fraction of the observations
+        ///added to this t-digest would be less than or equal to each of the specified cutoffs.
+        /// </summary>
+        /// <param name="key">The name of the sketch (a t-digest data structure).</param>
+        /// <param name="quantile">The desired fraction (between 0 and 1 inclusively).</param>
+        /// <returns>An  array of results populated with quantile_1, cutoff_1, quantile_2, cutoff_2, ..., quantile_N, cutoff_N.</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.quantile"/></remarks>
+        public double[] Quantile(RedisKey key, params double[] quantile)
+        {
+            if (quantile.Length < 1) throw new ArgumentException(nameof(quantile));
+
+            var args = new List<object> { key };
+            foreach (var q in quantile) args.Add(q);
+
+            return ResponseParser.ToDoubleArray(_db.Execute(TDIGEST.QUANTILE, args));
+        }
+
+        /// <summary>
+        /// Returns estimates of one or more cutoffs such that a specified fraction of the observations
+        ///added to this t-digest would be less than or equal to each of the specified cutoffs.
+        /// </summary>
+        /// <param name="key">The name of the sketch (a t-digest data structure).</param>
+        /// <param name="quantile">The desired fraction (between 0 and 1 inclusively).</param>
+        /// <returns>An  array of results populated with quantile_1, cutoff_1, quantile_2, cutoff_2, ..., quantile_N, cutoff_N.</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.quantile"/></remarks>
+        public async Task<double[]> QuantileAsync(RedisKey key, params double[] quantile)
+        {
+            if (quantile.Length < 1) throw new ArgumentException(nameof(quantile));
+
+            var args = new List<object> { key };
+            foreach (var q in quantile) args.Add(q);
+
+            return ResponseParser.ToDoubleArray(await _db.ExecuteAsync(TDIGEST.QUANTILE, args));
+        }
+
+        /// <summary>
+        /// Reset the sketch - empty the sketch and re-initialize it
+        /// </summary>
+        /// <param name="key">The name of the sketch (a t-digest data structure).</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise.</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.reset"/></remarks>
+        public bool Reset(RedisKey key, params double[] quantile)
+        {
+            return ResponseParser.OKtoBoolean(_db.Execute(TDIGEST.RESET, key));
+        }
+
+        /// <summary>
+        /// Reset the sketch - empty the sketch and re-initialize it
+        /// </summary>
+        /// <param name="key">The name of the sketch (a t-digest data structure).</param>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise.</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.reset"/></remarks>
+        public async Task<bool> ResetAsync(RedisKey key, params double[] quantile)
+        {
+            return ResponseParser.OKtoBoolean(await _db.ExecuteAsync(TDIGEST.RESET, key));
+        }
+
+        /// <summary>
+        /// Reset the sketch - empty the sketch and re-initialize it
+        /// </summary>
+        /// <param name="key">The name of the sketch (a t-digest data structure).</param>
+        /// <param name="lowCutQuantile">Exclude observation values lower than this quantile.</param>
+        /// <param name="highCutQuantile">Exclude observation values higher than this quantile.</param>
+        /// <returns>estimation of the mean value. Will return DBL_MAX if the sketch is empty.</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.reset"/></remarks>
+        public RedisResult TrimmedMean(RedisKey key, double lowCutQuantile, double highCutQuantile)
+        {
+            return _db.Execute(TDIGEST.RESET, key, lowCutQuantile, highCutQuantile);
+        }
+
+        /// <summary>
+        /// Reset the sketch - empty the sketch and re-initialize it
+        /// </summary>
+        /// <param name="key">The name of the sketch (a t-digest data structure).</param>
+        /// <param name="lowCutQuantile">Exclude observation values lower than this quantile.</param>
+        /// <param name="highCutQuantile">Exclude observation values higher than this quantile.</param>
+        /// <returns>estimation of the mean value. Will return DBL_MAX if the sketch is empty.</returns>
+        /// <remarks><seealso href="https://redis.io/commands/tdigest.reset"/></remarks>
+        public async Task<RedisResult> TrimmedMeanAsync(RedisKey key, double lowCutQuantile, double highCutQuantile)
+        {
+            return await _db.ExecuteAsync(TDIGEST.RESET, key, lowCutQuantile, highCutQuantile);
+        }
+
+
+
+
+
+
+
+
+
+
+
+
+
+    }
+}
diff --git a/src/NRedisStack.Core/TimeSeries/TimeSeriesCommands.cs b/src/NRedisStack.Core/TimeSeries/TimeSeriesCommands.cs
index 19a1ecec..c728b28c 100644
--- a/src/NRedisStack.Core/TimeSeries/TimeSeriesCommands.cs
+++ b/src/NRedisStack.Core/TimeSeries/TimeSeriesCommands.cs
@@ -17,7 +17,7 @@ public TimeSeriesCommands(IDatabase db)
         public bool Create(string key, long? retentionTime = null, IReadOnlyCollection<TimeSeriesLabel> labels = null, bool? uncompressed = null, long? chunkSizeBytes = null, TsDuplicatePolicy? duplicatePolicy = null)
         {
             var args = TimeSeriesAux.BuildTsCreateArgs(key, retentionTime, labels, uncompressed, chunkSizeBytes, duplicatePolicy);
-            return ResponseParser.ParseOKtoBoolean(_db.Execute(TS.CREATE, args));
+            return ResponseParser.OKtoBoolean(_db.Execute(TS.CREATE, args));
         }
 
         public TimeSeriesInformation Info(string key)
@@ -28,7 +28,7 @@ public TimeSeriesInformation Info(string key)
         public bool TimeSeriesAlter(string key, long? retentionTime = null, IReadOnlyCollection<TimeSeriesLabel> labels = null)
         {
             var args = TimeSeriesAux.BuildTsAlterArgs(key, retentionTime, labels);
-            return ResponseParser.ParseOKtoBoolean(_db.Execute(TS.ALTER, args));
+            return ResponseParser.OKtoBoolean(_db.Execute(TS.ALTER, args));
         }
 
     }
diff --git a/src/NRedisStack.Core/TopK/DataTypes/TopKInformation.cs b/src/NRedisStack.Core/TopK/DataTypes/TopKInformation.cs
index 906e8f14..eb6b5d2d 100644
--- a/src/NRedisStack.Core/TopK/DataTypes/TopKInformation.cs
+++ b/src/NRedisStack.Core/TopK/DataTypes/TopKInformation.cs
@@ -1,8 +1,8 @@
 namespace NRedisStack.Core.TopK.DataTypes
 {
     /// <summary>
-    /// This class represents the response for CMS.INFO command.
-    /// This object has Read-only properties and cannot be generated outside a CMS.INFO response.
+    /// This class represents the response for TOPK.INFO command.
+    /// This object has Read-only properties and cannot be generated outside a TOPK.INFO response.
     /// </summary>
     public class TopKInformation
     {
diff --git a/src/NRedisStack.Core/TopK/Literals/CommandArgs.cs b/src/NRedisStack.Core/TopK/Literals/CommandArgs.cs
index ed0e5b4e..0844e5dd 100644
--- a/src/NRedisStack.Core/TopK/Literals/CommandArgs.cs
+++ b/src/NRedisStack.Core/TopK/Literals/CommandArgs.cs
@@ -2,6 +2,6 @@ namespace NRedisStack.Core.Literals
 {
     internal class TopKArgs
     {
-        //TODO: TOPK doesn't have literals to save, consider deleting it, or keep it in case they need it in the future
+        // TOPK doesn't have literals to save, it's here in case they need it in the future
     }
 }
\ No newline at end of file
diff --git a/src/NRedisStack.Core/TopK/TopKCommands.cs b/src/NRedisStack.Core/TopK/TopKCommands.cs
index 9ad80080..80e40345 100644
--- a/src/NRedisStack.Core/TopK/TopKCommands.cs
+++ b/src/NRedisStack.Core/TopK/TopKCommands.cs
@@ -4,7 +4,7 @@
 namespace NRedisStack.Core
 {
 
-    public class TopKCommands //TODO: Finish this
+    public class TopKCommands
     {
         IDatabase _db;
         public TopKCommands(IDatabase db)
@@ -12,24 +12,24 @@ public TopKCommands(IDatabase db)
             _db = db;
         }
 
-        /// <summary>
-        /// Increases the count of item by increment.
-        /// </summary>
-        /// <param name="key">The name of the sketch.</param>
-        /// <param name="item">Item to be added.</param>
-        /// <returns>Array of simple-string-reply - if an element was dropped from the TopK list, null otherwise</returns>
-        /// <remarks><seealso href="https://redis.io/commands/topk.add"/></remarks>
-        public RedisResult[]? Add(RedisKey key, RedisValue item)
-        {
-            return ResponseParser.ToArray(_db.Execute(TOPK.ADD, key, item));
-        }
+        // /// <summary>
+        // /// Increases the count of item by increment.
+        // /// </summary>
+        // /// <param name="key">The name of the sketch.</param>
+        // /// <param name="item">Item to be added.</param>
+        // /// <returns>Array of simple-string-reply - if an element was dropped from the TopK list, null otherwise</returns>
+        // /// <remarks><seealso href="https://redis.io/commands/topk.add"/></remarks>
+        // public RedisResult[] Add(RedisKey key, RedisValue item)
+        // {
+        //     return ResponseParser.ToArray(_db.Execute(TOPK.ADD, key, item));
+        // }
 
-        /// <inheritdoc cref="Add(RedisKey, RedisValue)"/>
-        public async Task<RedisResult[]?> AddAsync(RedisKey key, RedisValue item)
-        {
-            var result = await _db.ExecuteAsync(TOPK.ADD, key, item);
-            return ResponseParser.ToArray(result);
-        }
+        // /// <inheritdoc cref="Add(RedisKey, RedisValue)"/>
+        // public async Task<RedisResult[]> AddAsync(RedisKey key, RedisValue item)
+        // {
+        //     var result = await _db.ExecuteAsync(TOPK.ADD, key, item);
+        //     return ResponseParser.ToArray(result);
+        // }
 
         /// <summary>
         /// Increases the count of item by increment.
@@ -40,38 +40,43 @@ public TopKCommands(IDatabase db)
         /// <remarks><seealso href="https://redis.io/commands/topk.add"/></remarks>
         public RedisResult[]? Add(RedisKey key, params RedisValue[] items)
         {
-            var args = Auxiliary.MergeArgs(key, items);
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
 
+            var args = Auxiliary.MergeArgs(key, items);
             return (RedisResult[]?)_db.Execute(TOPK.ADD, args);
         }
 
         /// <inheritdoc cref="Add(RedisKey, RedisValue[])"/>
         public async Task<RedisResult[]?> AddAsync(RedisKey key, params RedisValue[] items)
         {
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
+
             var args = Auxiliary.MergeArgs(key, items);
 
             var result = await _db.ExecuteAsync(TOPK.ADD, args);
             return (RedisResult[]?)result;
         }
 
-        /// <summary>
-        /// Returns count for an item.
-        /// </summary>
-        /// <param name="key">Name of sketch where item is counted</param>
-        /// <param name="item">Item to be counted.</param>
-        /// <returns>count for responding item.</returns>
-        /// <remarks><seealso href="https://redis.io/commands/cf.count"/></remarks>
-        public long Count(RedisKey key, RedisValue item)
-        {
-            return ResponseParser.ToLong(_db.Execute(TOPK.COUNT, key, item));
-        }
+        // /// <summary>
+        // /// Returns count for an item.
+        // /// </summary>
+        // /// <param name="key">Name of sketch where item is counted</param>
+        // /// <param name="item">Item to be counted.</param>
+        // /// <returns>count for responding item.</returns>
+        // /// <remarks><seealso href="https://redis.io/commands/cf.count"/></remarks>
+        // public long Count(RedisKey key, RedisValue item)
+        // {
+        //     return ResponseParser.ToLong(_db.Execute(TOPK.COUNT, key, item));
+        // }
 
-        /// <inheritdoc cref="Count(RedisKey, RedisValue)"/>
-        public async Task<long> CountAsync(RedisKey key, RedisValue item)
-        {
-            var result = await _db.ExecuteAsync(TOPK.COUNT, key, item);
-            return ResponseParser.ToLong(result);
-        }
+        // /// <inheritdoc cref="Count(RedisKey, RedisValue)"/>
+        // public async Task<long> CountAsync(RedisKey key, RedisValue item)
+        // {
+        //     var result = await _db.ExecuteAsync(TOPK.COUNT, key, item);
+        //     return ResponseParser.ToLong(result);
+        // }
 
         /// <summary>
         /// Returns count for an items.
@@ -80,15 +85,21 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// <param name="item">Items to be counted.</param>
         /// <returns>count for responding item.</returns>
         /// <remarks><seealso href="https://redis.io/commands/cf.count"/></remarks>
-        public long[]? Count(RedisKey key, params RedisValue[] items)
+        public long[] Count(RedisKey key, params RedisValue[] items)
         {
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
+
             var args = Auxiliary.MergeArgs(key, items);
             return ResponseParser.ToLongArray(_db.Execute(TOPK.COUNT, args));
         }
 
         /// <inheritdoc cref="Count(RedisKey, RedisValue[])"/>
-        public async Task<long[]?> CountAsync(RedisKey key, params RedisValue[] items)
+        public async Task<long[]> CountAsync(RedisKey key, params RedisValue[] items)
         {
+            if (items.Length < 1)
+                throw new ArgumentOutOfRangeException(nameof(items));
+
             var args = Auxiliary.MergeArgs(key, items);
             var result = await _db.ExecuteAsync(TOPK.COUNT, args);
             return ResponseParser.ToLongArray(result);
@@ -103,7 +114,7 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// and the Amount by which the item score is to be increased.</param>
         /// <returns>Score of each item after increment.</returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.incrby"/></remarks>
-        public RedisResult[]? IncrBy(RedisKey key, params Tuple<RedisValue, long>[] itemIncrements)
+        public RedisResult[] IncrBy(RedisKey key, params Tuple<RedisValue, long>[] itemIncrements)
         {
             if (itemIncrements.Length < 1)
                 throw new ArgumentException(nameof(itemIncrements));
@@ -125,7 +136,7 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// and the Amount by which the item score is to be increased.</param>
         /// <returns>Score of each item after increment.</returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.incrby"/></remarks>
-        public async Task<RedisResult[]?> IncrByAsync(RedisKey key, params Tuple<RedisValue, long>[] itemIncrements)
+        public async Task<RedisResult[]> IncrByAsync(RedisKey key, params Tuple<RedisValue, long>[] itemIncrements)
         {
             if (itemIncrements.Length < 1)
                 throw new ArgumentException(nameof(itemIncrements));
@@ -141,27 +152,25 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
             return ResponseParser.ToArray(result);
         }
 
-        // //TODO: information about what?
         /// <summary>
         /// Return TopK information.
         /// </summary>
         /// <param name="key">Name of the key to return information about.</param>
         /// <returns>TopK Information.</returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.info"/></remarks>
-        public TopKInformation? Info(RedisKey key)
+        public TopKInformation Info(RedisKey key)
         {
             var info = _db.Execute(TOPK.INFO, key);
             return ResponseParser.ToTopKInfo(info);
         }
 
-        // //TODO: information about what?
         /// <summary>
         /// Return TopK information.
         /// </summary>
         /// <param name="key">Name of the key to return information about.</param>
         /// <returns>TopK Information.</returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.info"/></remarks>
-        public async Task<TopKInformation?> InfoAsync(RedisKey key)
+        public async Task<TopKInformation> InfoAsync(RedisKey key)
         {
             var info = await _db.ExecuteAsync(TOPK.INFO, key);
             return ResponseParser.ToTopKInfo(info);
@@ -174,7 +183,7 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// <param name="withcount">return Count of each element is returned.</param>
         /// <returns>Full list of items in Top K list</returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.list"/></remarks>
-        public RedisResult[]? List(RedisKey key, bool withcount = false)
+        public RedisResult[] List(RedisKey key, bool withcount = false)
         {
             var result = (withcount) ? _db.Execute(TOPK.LIST, key, "WITHCOUNT")
                                      : _db.Execute(TOPK.LIST, key);
@@ -188,7 +197,7 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// <param name="withcount">return Count of each element is returned.</param>
         /// <returns>Full list of items in Top K list</returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.list"/></remarks>
-        public async Task<RedisResult[]?> ListAsync(RedisKey key, bool withcount = false)
+        public async Task<RedisResult[]> ListAsync(RedisKey key, bool withcount = false)
         {
             var result = await ((withcount) ? _db.ExecuteAsync(TOPK.LIST, key, "WITHCOUNT")
                                             : _db.ExecuteAsync(TOPK.LIST, key));
@@ -202,7 +211,7 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// <param name="item">Item to be queried.</param>
         /// <returns><see langword="true"/> if item is in Top-K, <see langword="false"/> otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.query"/></remarks>
-        public bool? Query(RedisKey key, RedisValue item)
+        public bool Query(RedisKey key, RedisValue item)
         {
             return _db.Execute(TOPK.QUERY, key, item).ToString() == "1";
         }
@@ -214,7 +223,7 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// <param name="item">Item to be queried.</param>
         /// <returns><see langword="true"/> if item is in Top-K, <see langword="false"/> otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.query"/></remarks>
-        public async Task<bool?> QueryAsync(RedisKey key, RedisValue item)
+        public async Task<bool> QueryAsync(RedisKey key, RedisValue item)
         {
             var result = await _db.ExecuteAsync(TOPK.QUERY, key, item);
             return result.ToString() == "1";
@@ -227,10 +236,10 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// <param name="items">Items to be queried.</param>
         /// <returns>Bolean Array where <see langword="true"/> if item is in Top-K, <see langword="false"/> otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.query"/></remarks>
-        public bool[]? Query(RedisKey key, params RedisValue[] items)
+        public bool[] Query(RedisKey key, params RedisValue[] items)
         {
             if (items.Length < 1)
-                throw new ArgumentNullException(nameof(items));
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             var args = Auxiliary.MergeArgs(key, items);
 
@@ -244,10 +253,10 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// <param name="items">Items to be queried.</param>
         /// <returns>Bolean Array where <see langword="true"/> if item is in Top-K, <see langword="false"/> otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.query"/></remarks>
-        public async Task<bool[]?> QueryAsync(RedisKey key, params RedisValue[] items)
+        public async Task<bool[]> QueryAsync(RedisKey key, params RedisValue[] items)
         {
             if (items.Length < 1)
-                throw new ArgumentNullException(nameof(items));
+                throw new ArgumentOutOfRangeException(nameof(items));
 
             var args = Auxiliary.MergeArgs(key, items);
 
@@ -265,9 +274,9 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// <param name="decay">The probability of reducing a counter in an occupied bucket. (Default 0.9)</param>
         /// <returns><see langword="true"/> if executed correctly, error otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.reserve"/></remarks>
-        public bool? Reserve(RedisKey key, long topk, long width = 7, long depth = 8, double decay = 0.9)
+        public bool Reserve(RedisKey key, long topk, long width = 7, long depth = 8, double decay = 0.9)
         {
-            return ResponseParser.ParseOKtoBoolean(_db.Execute(TOPK.RESERVE, key, topk, width, depth, decay));
+            return ResponseParser.OKtoBoolean(_db.Execute(TOPK.RESERVE, key, topk, width, depth, decay));
         }
 
         /// <summary>
@@ -280,10 +289,10 @@ public async Task<long> CountAsync(RedisKey key, RedisValue item)
         /// <param name="decay">The probability of reducing a counter in an occupied bucket. (Default 0.9)</param>
         /// <returns><see langword="true"/> if executed correctly, error otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/topk.reserve"/></remarks>
-        public async Task<bool?> ReserveAsync(RedisKey key, long topk, long width = 7, long depth = 8, double decay = 0.9)
+        public async Task<bool> ReserveAsync(RedisKey key, long topk, long width = 7, long depth = 8, double decay = 0.9)
         {
             var result = await _db.ExecuteAsync(TOPK.RESERVE, key, topk, width, depth, decay);
-            return ResponseParser.ParseOKtoBoolean(result);
+            return ResponseParser.OKtoBoolean(result);
         }
     }
 }
diff --git a/tests/NRedisStack.Tests/Bloom/BloomTests.cs b/tests/NRedisStack.Tests/Bloom/BloomTests.cs
index ad441070..6a8eb037 100644
--- a/tests/NRedisStack.Tests/Bloom/BloomTests.cs
+++ b/tests/NRedisStack.Tests/Bloom/BloomTests.cs
@@ -225,7 +225,7 @@ public async void TestExistsNonExistAsync()
     }
 
     [Fact]
-    public void TestInfo() //TODO: think again about the returned value of BF.INFO, maybe creating a new returned type
+    public void TestInfo()
     {
         IDatabase db = redisFixture.Redis.GetDatabase();
         db.Execute("FLUSHALL");
diff --git a/tests/NRedisStack.Tests/CountMinSketch/CmsTests.cs b/tests/NRedisStack.Tests/CountMinSketch/CmsTests.cs
index 346b0083..c744de70 100644
--- a/tests/NRedisStack.Tests/CountMinSketch/CmsTests.cs
+++ b/tests/NRedisStack.Tests/CountMinSketch/CmsTests.cs
@@ -86,7 +86,7 @@ public void TestKeyAlreadyExists()
     public async void TestKeyAlreadyExistsAsync()
     {
         IDatabase db = redisFixture.Redis.GetDatabase();
-        db.Execute("FLUSHALL"); //TODO: Check if I need Execute("FLUSHALL") to be Async in the async test
+        db.Execute("FLUSHALL");
 
         await db.CMS().InitByDimAsync("dup", 16, 4);
         await Assert.ThrowsAsync<RedisServerException>(() => db.CMS().InitByDimAsync("dup", 8, 6));
diff --git a/tests/NRedisStack.Tests/CuckooFilter/CuckooTests.cs b/tests/NRedisStack.Tests/CuckooFilter/CuckooTests.cs
index 70065a88..8689ad7d 100644
--- a/tests/NRedisStack.Tests/CuckooFilter/CuckooTests.cs
+++ b/tests/NRedisStack.Tests/CuckooFilter/CuckooTests.cs
@@ -169,7 +169,7 @@ public async void TestDeleteAsync()
     }
 
     [Fact]
-    public void TestInfo() //TODO: think again about the returned value of CF.INFO, maybe creating a new returned type
+    public void TestInfo()
     {
         IDatabase db = redisFixture.Redis.GetDatabase();
         db.Execute("FLUSHALL");
@@ -184,7 +184,7 @@ public async void TestDeleteAsync()
     }
 
     [Fact]
-    public async void TestInfoAsync() //TODO: think again about the returned value of CF.INFO, maybe creating a new returned type
+    public async void TestInfoAsync()
     {
         IDatabase db = redisFixture.Redis.GetDatabase();
         db.Execute("FLUSHALL");