#5 - If you accidentally bust a deer, don't assume that that necessarily means there are no more deer in the area.
#6 - If you are spot-and-stalking, and spot some deer up on a hill, always assume that there are more deer there than you can see. Keep this in mind when you start to get close, and keep an eye out for them.
#7 - Hunt where the deer are. Scout. If you don't see any while scouting, go somewhere else. Find water. They like bitterbrush and love alfalfa.
#8 - If you're waiting in ambush, don't spend too long watching those deer way up on the mountain through your binoculars. You'll miss the deer that walks 5 yards behind you.