My strategy has been youtube tutorials, and a lot of practice. Proko has a lot of great tutorial videos with a lot of variety in terms of style and difficulty. Marco Bucci has been probably the biggest help in terms of color theory. David Revoy is another good teacher, though most of his tutorial videos are more focused on Krita.
I thought he installed spyware on his and his son’s computers so that they WOULDN’T be wankers