SICP, Gödel Escher Bach, some theoretical works on computer science are a good start.

https://mitpress.mit.edu/sites/default/files/sicp/index.html

https://www.physixfan.com/wp-content/files/GEBen.pdf

https://plato.stanford.edu/entries/computer-science/

https://en.wikipedia.org/wiki/Computer_science#Further_readi...

Is there some reason why I am being downvoted? These are all highly-regarded books.