Personaly i found abcl a bad experience.
Thoughts on ecl & clisp ?
sbcl works nice & fine. But i’t’s the only lisp implementation i know.
There are good books on racket-scheme & chez-cheme.
The only book i know for lisp is, “Common lisp , a gentle introduction to symbolic computing”.
CL is, like, fourty? years old now. These books describe the standardized language, so most of their gotchas apply to any conforming implementation. So yes, the books are “OLD”, and yes, they are “GOOD”.