This page is kinda intended as a quick way of listing the various nifty commands in vi(1) and vim(1), see VimHowto for a "introduction" style

Movement Commands

h,j,k,l

left, down, up, right

fx

Move to next charactor x.

Fx

Move to previous charactor x

tx

Move to before next charactor x

Tx

Move to after previous charactor x

%

Goto matching charactor

Action(?) Commands

c

Change, delete text and go into insert mode

C

Change line

y

Yank (copy)

Y

Yank Line

d

Delete (cut)

D

Delete Line

p

Paste after

P

Paste before

Misc commands

v

Visually select by character

V

Visually select by line

mx

Save cursor position into register x

`x

Goto character position in register x

' x

Goto line in register x

"x

Use buffer x for next yank/delete/paste operation

qx...q

Begin recording commands (...) into register x

@x

Playback commands in register x

@@

Playback previous playback

.

Repeat command

Useful examples:

ct"

Change everything until the next "

:g!/foo/d

globally, for every line ! not containing the regex "foo", delete that line