It depends on the kind of beginner. GNU Emacs has a built-in tutorial to get started on using the editor. After that, there's an introduction to Emacs Lisp as p

It depends on the kind of beginner. GNU Emacs has a built-in tutorial to get started on using the editor. After that, there's an introduction to Emacs Lisp as part of the info documentation in most packaged versions of Emacs. Extending Emacs is as practical a way to learn Lisp as others.