Highly recommend the lecture series. He makes it accessible and fun

Seriously, second this. It was extremely helpful. I had both the background in programming and abstract algebra but it wasn't until this course that I was really on the path to understand what was going on with category theory.

Or direct[-ish] link to TFA's PDF: https://github.com/hmemcpy/milewski-ctfp-pdf/releases/downlo...

-ish: since it's doing something untoward involving AWS, but the link does resolve to a actual PDF file, unlike the original submission.