@dimsumthinking any thoughts / advice on learning Math as a retired adult?

I got lost as a kid and never made it past Algebra. So I’m wondering if there are some delightful resources for learning as an adult. I recall from my childhood an old algebra text by Asimov that was so clear it clicked in the way modern textbooks of the era did not. After learning to program, I’m inspired to have more math in my life. Is there some computer based product you’d recommend?