Playground for learning Common Lisp.
On the command line use $ rlwrap sbcl to open the REPL with arrow keys and backspace being enabled.
A Road to Common Lisp by Steve Losh
Common Lisp: A Gentle Introduction to Symbolic Computation by David S. Touretzky
Practical Common Lisp by Peter Seibel
Use (load "path-to-file-in-parentheses"), e.g., (load "hello.lisp").