The level of instruction on those videos isn't great. Rick Pallet did a video with the Borlands years ago that was pretty good. They were the owners of Minaska game calls. It was probably about 20 years ago. Also, around that time some good articles were written on the subject.
Coons den in different areas in different climates as well as different times of the year. They partially hibernate when it gets extremely cold, so the days that are unseasonably warm usually produce the best. They aren't real smart but if they see you or hear you approach the stand your odds go down. SOME are stupid enough you can hold the call out of the window of a pickup in a pasture and kill them. That's probably less than 1%, so don't believe the stories about hunting that way being super effective. Also, surprisingly enough, it helps to play the wind.
Download a bunch of coon fights and some coon in distress. Work through the sounds at about 60 seconds each until you get a response. Start with the least aggressive and move to the most aggressive. Once you get a response to the call, keep playing that sound on that stand unless it appears they are losing interest. Like coyotes, changing the sound will grab their interest. Hide the call on the back side of the tree away from the hole or use a decoy. It doesn't have to look like a coon, you just need movement. They will sit and look at the call from the den if there is no decoy and they can see it. If you haven't seen a coon in 5 minutes, the likelihood of a response is very low.
Don't jump up and end the stand the moment you get a kill. We have killed as many as 6 from one den tree and 13 from a stand between 2 old abandoned buildings. Both times we were on stand for over 20 minutes.
Hopefully this helps some.