I’ve enjoyed these two series very much, and they are free!
Gay Kraeger’s Watercolor Sketching and Journaling Pts 1-4
https://www.youtube.com/user/StrathmoreArtist/search?query=kraeger
Great examples of how much paint to put in the puddle and how much paint to load on your brush. Also good info on composition, etc.
Bob Burridge’s Oil Painting Series Pts 1-4
https://www.youtube.com/user/StrathmoreArtist/search?query=burridge
He paints with oils in this series but everything he’s teaching about color, composition, lighting, etc. applies to watercolors. Great foundation info for any type of painting you might want to do. Highly recommend.