Regardless of how much you know about the painter Agnes Martin, I recommend this piece on her: 35 Odd Jobs Celebrated Painter Agnes Martin Held Before She Became an Artist – Brain Pickings.
The title is odd, but don’t let it put you off. Martin is a fascinating person, and a great artist. I find her work challenges me like no other. But it rewards too. I hope you will learn more about her and feel the same.