When growing up, I struggled with math. Part because my ADD made it incredibly hard to read books from start to finish, part because I had very little interest

When growing up, I struggled with math. Part because my ADD made it incredibly hard to read books from start to finish, part because I had very little interest in STEM classes, and part because we had a math teacher that would focus all his energy on the top students. If you struggled with something, and he didn't deem you worthy, he'd simply direct you to the book "read the book". It wasn't until undergrad that we had this fantastic calculus lecturer - everything just made sense. He started at the very, very beginning; adding together numbers, and worked his way up to pre-calc, in around 2 weeks. He never skipped any steps, and was very good at explaining the implications of various proofs, and pointing out the typical / common errors and fallacies made by students. Of course, if you had a good grasp of math leading up to calculus 1, this was all boring and old news. No big deal, those students would skip classes, it was after all in the very beginning of the semester. But for me, it was simply life changing. And parallel to that, people started posting vids and websites explaining math. I suddenly had multiple different sources of people trying to explain math their way - which also turned out to be invaluable. Suddenly this guy Salman Khan started posting vids on youtube, and I discovered Pauls Math notes. Well, the rest is history for me - I graduated with good grades in all math courses, and a love for math. If anything, it thought me that there's no single way of teaching math. Again, when I grew up, it was one book and one teacher.