Computer science: Knuth's TAOCP. And Sipser's Introduction to the Theory of Computation.
Programming: SICP, K&R, and Stroustrup. Siebel's Practical common lisp.
Artificial intelligence: AI a modern approach.
Signals and Systems: Oppenheim's book
Probability and statistics: Probability Theory: The Logic of Science by Jaynes
I try to find lectures online of professors who wrote books. Good example is Mr. Gilbert Strang. Good books and lectures. For theory of computation Sipser Michael.
Signals and Systems by Opprnheimer. And so on.