you go out in the woods with a big ass flashlight, shine it around
the deer look at the light, you can see their eyes reflecting it back, and it kinda freezes the deer
(headlights on a car do more or less the same thing, which is why they don't jump out of the way of a Ford Transit van, even with the tires screeching to a stop and the horn blowing like the archangel Gabriel himself was arriving)
now you just line up the rifle and bang, venison dinner