[archerface]

For the highly customizable text editor like emacs (the better one) or vim, start with a the editor from scratch and build it out. Look for the 'popular' configurations in the editor's community and glean cool snippets from it. That is what I did with emacs and once you get in that discovery and tinker state of mind, you will always learn something new that just blows your mind and makes your life easier.

The TL;DR: dive head first into some editor and try to immerse yourself in the thinking of the editor.