I would recommend: When you want to customise the behaviour of some command, don't google for the answer. Instead do `C-h f` or `C-h k` to read the built-in doc

I would recommend: When you want to customise the behaviour of some command, don't google for the answer. Instead do `C-h f` or `C-h k` to read the built-in documentation for that function or key. From the help screen, click the link to view the function's source code -- if you don't see that link install the "emacs-el" package (using your system's package manager). See what variables that function uses. Do `C-h v` to read the documentation for each variable. If you like this approach, I've written a guide (http://david.rothlis.net/emacs/customize_c.html http://david.rothlis.net/emacs/customize_c.html) which, at 3,000 words, is half the length of the Emacs manual table of contents.