* Recommendations on learning Common Lisp: https://news.ycombinator.com/item?id=25442155
* On Lisp communities on Reddit r/lisp and Freenode #lisp: https://news.ycombinator.com/item?id=25543565
* Observations on State of Common Lisp Survey 2020: https://news.ycombinator.com/item?id=25291780
* Lisp in Vim with Slimv/Vlime: https://news.ycombinator.com/item?id=21735148
* Emacs4CL (a tiny quick starter ~/.emacs): https://news.ycombinator.com/item?id=25440690
Like many others commenting here, I too use SBCL because of its good performance. I keep CLISP around mainly for nostalgia's sake. I began learning Common Lisp in Sep 2007 during a long layover at an airport using CLISP 2.41 on Debian 4.0 (Etch). Also, having another implementation helps me to test that my code is portable and does not rely on any SBCL-specific features.