If you're starting to learn, please contribute to http://Lisp-Lang.org at the very least by highlighting parts that may need improvement for a new learner by opening an issue at
https://github.com/LispLang/lisplang.github.io
But to answer your question directly, when I was re-learning CL circa 2005 long after university, I populated these pages as I went along:
https://play.org/links/lisp-intro
(I've meant to fold content from those into Lisp-Lang.org but never found/made the time. I did, however, prune obsolete bits earlier this year.)
Best of luck to you!
If you or anyone seeking to learn is in Vancouver, Canada, feel free to reach out and meet for coffee/tea/beer/cider.