I would start with lambda calculus. If you pick the right intro video, they'll stray into combinators: https://www.youtube.com/watch?v=3VQ382QG-y4 https://www.y

I would start with lambda calculus. If you pick the right intro video, they'll stray into combinators: https://www.youtube.com/watch?v=3VQ382QG-y4 https://www.youtube.com/watch?v=3VQ382QG-y4 is very good.