Comment by yep31

I'll quote my other comment:

If you want to learn math, a good place to start would be AoPS curriculum https://artofproblemsolving.com/store/recommendations

Continue with Susan Rigetti's curriculum https://www.susanrigetti.com/math

You can get answers to your questions here https://www.reddit.com/r/learnmath/ and here https://math.stackexchange.com/