How to use Vim

Vim is a text editor that can be used in the terminal window.
It starts in a read-only mode.
When you enter a edit mode you can go back using Esc.

/<text>             Search for text.
:!<command>         Execute terminal command.
:set ts=4           Set tabs to 4.
:set expandtab      Convert tabs to spaces.
:w                  Save file.
:q                  Quit.
i                   Edit text.
gg                  Jump to first line.
Shift+g             Jump to last line.
u                   Undo.
Ctrl+r              Redo.
p                   Paste copied text.
v                   Select text.
    d               Cut selected text.
    y               Copy selected text.
Shift+v             Same as when selecting text, but whole lines.

The clipboard in Vim is separated from the window clipboard.
Use the right-click menu to copy or paste from the window clipboard.
If you need to show code on the IRC/Reddit use Gist.