Left-right and up-down motions

h, j, k, l: left, down, up, right
^e: scoll window down (ctrl + e)
^y: scroll window up
^f: scroll down one page
^b: scroll up one page
H: move cursor to the top
M: move cursor to the middle
L: move cursor to the bottom
gg: top of file
G: bottom of file
t<char>: till some character
T<char>: till some character (backward)
f<char>: find forward (it will include the found character, unlike till)
F<char>: find backward

Text objects motions

<n> w: n words forward (n is optional)
b: beginning of word
e: end of word
{: beginning of paragraph
}: end of paragraph

Text objects (only in visual mode or after an operator)

s: sentences
p: paragraphs
t: tags (html/xml only)

Copying and moving text / Inserting text

d{motion}: delete/cut (dd to delete entire line)
p: paste (a line that was cut for instance)
c: change (replace)
D / C: delete/change until end of line
y{motion{: yank (yy to copy entire line)
>: indent
^: go to beginning of line
$: go to end of line
I: go to beginning of line and enter insert mode
A: go to end of line and enter insert mode
o: add a new line below and enter insert mode
O: add a new line above and enter insert mode

Examples

General rule: [optional number to repeat]{command}{text object or motion}.

diw: delete in word
caw: change all word (all will grab surrounding whitespaces)
yi(: yank all text inside parentheses
di[: delete between square brackets
va": visually select all inside doublequotes (including doublequotes)
3dd is equal to d2j
3J: join the next three lines into 1 line
d5}: delete from the current line through the end of the fifth paragraph down from here

Registers

:reg: access the registers
i (insert mode) then ^r and a register letter to paste from it, instead of "{register}p.
m{register}: mark a cursor position in some register
`{register}: go back to the marked position
'{register}: go to beginning of line where there is the marked position
d`a: delete from here to position marked in register 'a'

Autocomplete (in insert mode)

^x^n: for just this file
^x^f: for filenames
^x^]: for tags only
^x^l: whole lines
^n and ^p: go back and forth in the suggestion list

(^n is disabled by YouCompleteMe.)

Regex

Interactive find and replace

:%s/foo/bar/gc

% means whole document, not just the current line.

/g means every occurence, not just the first one. /c is the interactive option.

Capturing groups

:%s/abc\(def\)ghi/ko\1ok/g

Will print kodefok.

Non-greedy search

Normally, to search in a non-greedy way, we add a punctuation mark, as in .*? which means any string of characters as short as possible. For instance:

/<.>(.*?)<.>/

Applied to the string abc<p>def<a>ghi<b>jkl would match <p>def<a> and capture def. To make non-greedy searches with Vim, replace *? with \{-}.

Misc

Split the screen in half and display two different parts of a given file

:vsp
:set scrollbind

Then, on the right pane, scroll down or up, further in the file, and do:

:set scrollbind

From that point on, as you scroll on one pane, the other one will follow. To undo:

:set noscrollbind

Other

v: visually select (enters visual mode)
.: repeat the last command
~: invert the case for current char
/: search something (c/myvar, delete and insert from here to myvar)
:earlier 2m: go back to state in history that is 2 minutes old
:cl: to list errors
:cc# to jump to error number #
:cn and :cp: to navigate forward and back
:help ^n: to know about what ctrl n does
:help c_^n: ctrl n in command mode
:help i_^n, :help v_^n: ctrl n in insert mode or visual mode
:helpgrep whatever: search in all documentation, then use :cl, :cc, :cp, :cn

Vim Tricks