That was the progression when I took (the now well-known) CS50 at Harvard. Learn C first, then Lisp, then write a Lisp compiler in C. That was a lot of years ag

That was the progression when I took (the now well-known) CS50 at Harvard. Learn C first, then Lisp, then write a Lisp compiler in C. That was a lot of years ago, so one could argue that is an outdated approach now, but I think it still provides a strong foundation of CS fundamentals.