Category theory
Overview
Useful links
Eugenia Cheng
Bartosz Milewski's Programming Cafe
Category Theory for Programmers: The Preface
Awodey Category theory
How to Bake Pi: An Edible Exploration of the Mathematics of Mathematics
https://www.youtube.com/watch?v=ho7oagHeqNc
https://www.youtube.com/watch?v=I8LbkfSSR58