Go for Clojure if you want to explore Functional Programming, Clojure is 21st Century Lisp.

Some good resources: 1. https://github.com/hemanth/functional-programming-jargon 2. https://maryrosecook.com/blog/post/a-practical-introduction-... 3. http://www.secretgeek.net/lisp_truth 4. http://www.buildyourownlisp.com/ 5. OS Written is Lisp: https://github.com/froggey/Mezzano 6. For Clojure: https://changelog.com/posts/rich-hickeys-greatest-hits 7. http://yogthos.github.io/ClojureDistilled.html 8. SICP https://mitpress.mit.edu/sicp/ 9. Lisp http://www.gigamonkeys.com/book/