Scheme has kind of a different culture from Common Lisp. Most of the material is oriented towards students in order to teach the timeless stuff in computer science.

I learned C before I learned any functional languages and I regret it to this day. It took me _years_ to undo the damage. I really dug myself into a hole, too, by learning all about pointers and low-level stuff like that before I ever knew what Python, Ruby, etc. were.