As a programmer interested in category theory, I found this book a rather good balance between the abstract non-sense of CT and what I might actually use in programming. I wonder if anyone else has good books to recommend? I feel that the contents of the book remains a bit hard to appreciate in full unless you have ran into these concepts previously.
Not sure of your level, but as a beginner, these two were recommended to me on HN previously: - https://www.cambridge.org/highereducation/books/conceptual-m... - https://bartoszmilewski.com/2014/11/04/category-the-essence-... (a blog series on CT specifically for programmers)
Edit: Also realized you're in Oulu, feel free to email me if you'd be up to meeting in-person to discuss these further!