A common frustration for (impatient) beginners is to see different function names to access common data structures (alists, plists, hash-tables) and their inconsistencies (the order of arguments). Now they are well documented in the… Common Lisp Coobook of course: https://lispcookbook.github.io/cl-cookbook/data-structures.html, but still; and it is annoying to try things out with a data structure and refactor the code to use another one. The library Access solves those problems, it’s always