From the manual:
“Emacs is the extensible, customizable, self-documenting real-time display editor.”
and Gnu download page:
“At its core is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing.”
Getting org help (from Stack Exchange:
For my notebook.org, will need htmlize.el in the same directory as the notebook.
Ergoemacs provides lots of useful information and tips for using Emacs.