This page describes some common coding convention that you'll see in lisp source code.
- Comment out blocks of code
#||
...
...
||#
Tabs are evil in CL code. Do not use tabs. Put (setq indent-tabs-mode nil) in
~/.emacsLisp Style (Peter Norvig and Kent Pitman)
Lisp Style Tips for the Beginner
Google Common Lisp Style Guide