https://www.skillshare.com/
Skill Share is an awesome online resource for learning how to do things like paint with watercolor, graphic design, illustration, selling your artwork, drawing, hand lettering and caligraphy, photography, and even cooking.
You can get the first 3 months for $0.99 Here: http://skl.sh/2iCbs2x
After that, they charge $12 a month.
I've taken several classes and have really enjoyed them!