I know basic geometry and algebra, I know trigonometry but I don't understand it, I'm willing to learn math but 95% of books are not suited for my knowledge (they are too advanced). What are some good books I can read? I especially like reading proofs and problems whit sigma (series ). Sorry for my bad spelling.
I need advice for learning math:
Where to start?
Your story would help too.
P.S. I like some educational channels.