I just graduated university this year and used the site in high school and a little bit in university (just freshman year calculus). I don't remember how I foun

I just graduated university this year and used the site in high school and a little bit in university (just freshman year calculus). I don't remember how I found the site, either I was Googling math stuff, or a friend was and sent me a link. Many friends in high school and university used the site, it's definitely still popular. A high school teacher may have recommended it as well. It's a great site.