Modes

i - insert mode
v - visual mode
V - visual line mode

Keys

h - cursor left
l - cursor right
j - cursor down
k - cursor up
d - delete
u - undo
y - copy
p - paste
yy - copy line
. - last command

Commands

:w - write
:q - quit
:x - write and quit
:pwd - current workind dir
/{search} - search for a string (n - for next occurence)
:e . - current working directory