If ground hunting, make sure you clear out the leaf litter, twigs, etc where your standing. This will provide a near silent pad to allow you to move (slowly) on.

Hunting the wind is crucial. Get a windchecker app on your smartphone (I use one by Primos). Also helpful is a talcum powder squeeze bottle to visually check where your stink is blowing.

Plan your movements so your not stomping out the paths deer will be taking and move silently as possible enroute to the spot you will be hunting.

While in your stand, conserve your movements and if you have to move, make it slow. The deer will see you before you see them if you don't control every movement. Even scratching your nose, or turning your head to scan the area should be slow and methodical. Have fun with it, go back to the days when you were a boy in the woods and pretending you were GI Joe stalking Cobra.