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 ht

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 https://artofproblemsolving.com/store/recommendations Continue with Susan Rigetti's curriculum https://www.susanrigetti.com/math https://www.susanrigetti.com/math You can get answers to your questions here https://www.reddit.com/r/learnmath/ https://www.reddit.com/r/learnmath/ and here https://math.stackexchange.com/ https://math.stackexchange.com/