Excellent questions Martee. I first played golf 23 years ago in my middle 30s. I became 100% skeptical of all golf instruction very quickly. I figured out on my own that the hands had to come through before the clubhead, but believed both wrists had to cock-- years of mediocre play. Quit for a couple years a couple times. Could never figure out what was wrong, why I could never be consistent. Actually heard of TGM many years ago, but assumed it was just another scam. When Brian Manzella said straight left wrist bent right wrist on a post at FGI a couple years ago, I just slapped my forehead and said Eureka! I had many lessons over the years--- why was I never told this before? I bought Ben Doyle's Video and Hebron's Secrets & Lies book, and have made lots of improvement-- to the point where I need a couple lessons... but now I know who I can trust.
I still forget most of what I read about golf instruction, even here!
But the topics that are on point with what I'm working on are ALWAYS helpful.
2-dimensional videos and written instructions are dangerous! Even when it's accurate and precise-- if it isn't something I'm ready for, I will ignore it.
Thank you Yoda for this wonderful site! And thanks for the good question Martee!