How to Bake π by Eugenia Cheng

     An introduction to category theory. The study of abstractions of abstractions and the mathematics of logic and groups and topology. I am sure it is an amazing field, but seems too difficult for me. This book is good and interesting. Each chapter starts with a recipe. She is trying to make mathematics friendly and she succeeds but I would need three more books between this one and The Joy of Abstraction which really get into the math.