full screen shot - cmd, shift, 3

select screen shot - cmd, shift, 4

close window - cmd, w

close tab - cmd, t

close program - cmd, q

“alt tab” - cmd, tab

log out - cmd, shift, q

“ctrl alt del” - cmd, opt, esc

reboot - cmd, ctrl, eject

shutdown - cmd, opt, ctrl, eject

option boot - hold option

clear pram - cmd, opt, p, r

clear sm. - left shift, ctrl, opt, power

find - cmd, f

spotlight - cmd, spacebar