You say you are reading and watching videos re. deer hunting. Great way to learn about it. There must be some good videos out there on the use of scents.
I don't use them much but I have used them to stop a buck so I could get a shot.

I was once watching an oilfield road and a narrow pipeline that crossed it at right angles. I drove down the road, spraying (sex) scent out the window as I went. Then I walked down the pipeline spraying scent allong it. Back at my ground blind I waited a couple hours and out stepped the buck I was after on the pipeline. He stood with his nose in the air sniffing the scent as I got my scope on him and desided he was the one I wanted.

Another way I have used scent is like this. If the wind is from the west (as it usually is in my area), I put out film containers with scent, a little to the south of my stand and a little to the north. Any deer traveling on a north south course (or vis versa) will get into the scent stream of the scent I put out before they hit my scent stream. They may follow it to where I see them.

Robin