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Learn Lisp the easy way: Read the Introduction to Programming in Emacs Lisp, written by Robert J. Chassell. Highly recommended for those without prior Lisp programming experience.
Until Emacs 21, the EmacsLisp introduction was distributed separately. The introduction comes in Texinfo format, which means that it can be converted to a variety of formats, such as info and HTML.
The way to read the intro is to type ‘C-h i’ to start Info, and then `m Emacs Lisp Intro RET' or evaluate (info "(eintr) Top"). See InfoMode for help on using Info. Note that in some systems, Emacs info documentation containing the introduction must be installed separately, for example, in Debian sudo apt install emacs-common-non-dfsg would do the trick.
Get the emacs-lisp-intro file from any GNU FTP mirror or from:
Here is some more information about the Emacs Lisp Introduction (PDF format): http://www.gnupress.org/Intro-Elisp-Review1.pdf (link down as of 2010-02-14, but see archive.org).
You will also want the EmacsLispReference as you start to learn how Emacs Lisp works. Note: EmacsLispIntro is for beginners; EmacsLispReference is truly a reference, not a tutorial.
Solutions to the exercises on Emacs Lisp Intro: https://github.com/RenWenshan/emacs-lisp-intro-solutions