Cheatsheet for VIM

A    append end 
i    insert
O    insert one line above
o    insert one line below
r    change one character
p    print some selection or paste something after dd
ce   change the word
d2w  remove two words
dd   remove one line
d$   remove from cursor until end of line
x    delete one charater similar to delete
m    mark
ma   mark a
0    go to beginning of the line
$    go to end of line
h    left
j    down
k    up 
l    right
gg   go to the beggining line of the file
G    go to the end of the file
>>   go one tab forward
<<   go one tab backwards
u    undo 
ctrl+r redo
w    go forward one word
b    go backward one word
2w   go forward 2 words
{    go forward one paragraph
}    go backward one paragraph

:set sw=2  set tab spaces to 2

:ctrl-f      show command histry
:! <command> run a command on the shell
:g           do something globally
:.!ls       paste ls output to the current cursor
:1!ls       paste ls output to the first line
:p          print
:!git status execute git status on another buffer

Selection

:.            current cursor
:.,$          current to end 
:'a,$         from mark a to end
:.,$!sort -u  sort unique all lines from cursor to end
:'a,$p        print on another buffer from mark a to end 
:.,$s/str1/str2/g  replace all occurences of str1 with str2 on lines from cursor to end
:1,100s/str1/str2/g replace all str1 with str2 on lines 1 to 100
:'a,'bs/str1/str2/g replace all str with str2 on mark a line to mark b line 
:.,$!jq '.'         pipe all lines from cursor to end to jq on another buffer
:Explore      explore
:new          newfile 
:split        split the window
:close        close the buffer
:'a           mark a

Tricks

ctrl+n        autocomplete tries to find similar string and completes it
''            will go to previous line
!!            will open :.!
Copying
1. ma      mark a
2. go down to until where you want to copy
3. y       yank
4. 'a     until a 
5. p       paste


On command line you can use vi mode by command 

set -o vi 

and revert it back using 

set -o emacs