When I chained for turning, I would skip chaining on sc and would just pull the last loop a little larger then work the first st or I would chain and not work a st in the last st of the previous row. For years I thought that was the right way and only learned later that it wasn't and old habits are hard to break, and it worked for me. I would ch 1 loosely for hdc, chain 2 loosely for dc, ch 3 loosely for tc. It's simply a matter of what you find works for you and produces the result you prefer. I counted the turning ch as a st and didn't work a new st in top of the last one.
I don't know about Charlotte, I do believe her skills and accomplishments far exceeded mine, but I counted the posts when counting sts, 1 post per st, because I could actually feel them and prefer doing it that way.
My fave videos for crochet were done by Bethintx1. I just liked her and her way of demonstrating. As you watch the videos remember that different people do things differently and come up with very similar results. One thing you might like to learn is the foundation single crochet (you can use the method for dc and hdc also, and though I never did probably tc) which I thought was much better than chaining for a large project and generally gave a much nicer edge.
I think knitting is easier than crochet and I know it's less stressful on my hands and wrists. It could be that's because of how I crocheted and if I worked at it could reduce the stress. :shrug: Find what works for you and have fun. There are no crochet police.