Structure and Interpretation of Computer Programs (aka SICP), available here https://mitpress.mit.edu/sicp/full-text/book/book.html https://mitpress.mit.edu/sic

Structure and Interpretation of Computer Programs (aka SICP), available here https://mitpress.mit.edu/sicp/full-text/book/book.html https://mitpress.mit.edu/sicp/full-text/book/book.html Uses Scheme (which is a dialect of Lisp) as its teaching language. This book was used at MIT for their introductory programming course. It provides a fairly deep dive into the fundamentals of functional programming.