$mod
refers to the modifier key (alt by default)
startx i3
start i3 from command line$mod + <Enter>
open a terminal$mod + d
open dmenu (text based program launcher)
$mod + shift + e
exit i3$mod + shift + r
restart i3 in place$mod + shift + c
reload config file$mod + shift + q
kill window (does normal close if application supports it)
$mod + j
focus left$mod + k
focus down$mod + l
focus up$mod + ;
focus right$mod + a
focus parent$mod + space
toggle focus mode
$mod + r
resize mode ( or to leave resize mode)$mod + w
tabbed layout$mod + e
vertical and horizontal layout (switches to and between them)$mod + s
stacked layout$mod + f
fullscreen
$mod + e
default$mod + s
stacking$mod + w
tabbed
$mod + <shift> + <space>
toggle floating$mod + <left-mouse-click>
drag floating