I have killed very very very few deer in deep timber (1 or 2 out of the 40+ I have killed), most of mine have been in really open woods or on the edge of fields/meadows.
That.
Deer are 'edge habitat' animals.
You want to find where they cross from woods/swamp/marsh into bean/corn/hay fields and post your butt there.
Deep woods/swamps is very tough hunting. You can look for intersections of major deer trails or a scrape, but it might take you a long time to pattern the deer movement through those areas, and those times might be at 10 at night.
You really can't 'stalk' them in areas like that either- they will almost always see you first.
If you have white oaks that are dropping their acorns, sit there.
Other than that, get to your stand
at least an hour, (2 hrs would be better) before sun up and sit tight until after sun down. You won't be able to legally shoot during these hours, but you will spook a lot less deer.