Everything, and I mean everything in the bush makes noise when it moves. The wind, trees, and the animals. Nothing can walk around completely quiet. If there are wind gusts, move when the wind does, stop when it is still. If it is noisy underfoot for you, it is noisy for everything. Deer are inquisitive, they don't like to move unless they see you or smell you. I have had deer brake off after I have passed them. I have had deer run at me. Stags rub trees, shake a bush every now and then and see what happens. We have 2 legs, that is what is distinctive about the way we move thru the bush, it isn't a normal sound. Move slowly, and then even slower when in the hot zone, but don't try to hunt every inch of land you cover, it is too hard. Your concentration will go and you will just get frustrated. Take a break, 15 minutes to sit down and listen to the sounds around you. Work gullies, spend some time glassing, then go to the next. If you bump a deer then you are on the right track. The trick is to see them before they see you.
You don't learn if you don't make mistakes.