I love Shayda Campbell’s channel. She speeds up her videos a bit(like most people) so you have to pause a lot to finish a step, but I’m usually pretty happy with how things turn out.
You could also get books - I have this one and it’s been a lot of fun and great learning.
Watercolor with Me in the Ocean https://www.amazon.com/dp/1624148573?ref=ppx_pop_mob_ap_share