Ah man so sorry. I meant to reply earlier and everytime I remember to, I forget. Basically, this guy is a golden ray of insight. xD
I link his channel because he covers a lot of topics you may find useful. He's a very skilled, very experienced artist and I personally found that he broke things down in a way for me that made things easier to understand.
This is one of the hand videos specifically, because it's a bit further down in the list.
Edit: Oh yeah... there's ton of dad jokes too. So be prepared.