Trynna learn calculus for fun by myself. I'm in grade 9 and feel like getting a headstart. Not really preparing for an exam or anything. Any good resources I could use to help?

Don't really remember the name of the documentary but we were shown this BBC movie about Andrew Wiles and Fermat's Last Theorem in high school and it was pretty good.

Out of curiosity, how did the great ancient romans even do math.