All types in lisp that are programmer's integer, string, symbol .. about 20) , as oppoesed to special elisp editing types.
Everything starting with # like #
Start here, and click on “Practical elisp“ or “Lisp Basics“. Menu on the left
Check the 3 links on the bottom. Alist is list of cons cells. Every list is also Alist: (list-utils-safe-equal '(1 2 3 4) '(1 . (2 3 4))) ==> true