Don't know if they're on YouTube, but the first series I watched were from Tom Griffin, Tom's Techniques. We all start from some place, watching his video(s) showed me how to use an edge finder. I didn't realize that you had the mill running and watched for the "kick". I'd set the lower portion flush with the upper and move the table until I felt movement with my fingernail.
Tom gives advise on set ups for centering a rotary table, cutter speeds, etc. He's a retired shop teacher and from what I gathered from his videos is a really good teacher.
I had a lot of "butt time" at work for a stretch when our car assembly plant was down and watched 350 of Mr. Pete's videos. Really good choice for beginners and experienced machinists.
I don't follow anyone at present, just do a YouTube search for a technique I'm interested in learning at a given time.
Bruce