Dcumentation - Keyboard shortcuts

Creating
click+drag	create a new brush
Selecting
esc	deselect
shift+click	add object to selection
shift+drag	box selection
click inside selection+drag	move selection
click outside selection+drag	resize selection
backspace	delete selection
h	hide selection
shift+h	show hidden
i	invert selection
shift+ctrl+r	selection to region
Editing
ctrl+z	undo
ctrl+y	redo
v	toggle vertex edit
e	toggle edge edit
f	toggle face edit
ctrl+m	make selected brushes detail
ctrl+u	CSG merge
shift+u	CSG substract
Edit modes
w	translate tool
r	rotate tool
q	resize tool (default)
x	clipper tool
Clipper tool (x)
enter	cut and delete left hand side
shift+enter	cut
Textures
shift+ctrl+click	select face
t	open textures window
s	open surface inspector
shift+arrows	move texture
ctrl+arrows	scale texture
shift+pgup/pgdn	rotate texture
shift+t	toggle texture lock
Properties
n	Open entity properties window
View
1..9	grid size
0	toggle grid
j	toggle measures
ctrl+d	toggle detail brushes
shift+ctrl+d	toggle structural brushes
alt+0	toggle lights
alt+2	toggle entities