overview.org contains an overview of My Emacs background and lists most of the packages I’ve written throughout the years.
This was presented at the Stockholm Emacs Meetup 2018-11-28.
In font-lock-introduction.org, I present how to Emacs handles syntax highlighting, how to write your own font-lock rules, and a number of tools
This was presented at the Stockholm Emacs Meetup 2015-06-11.