Via Artur Malabarba we have a link to an excellent set of Emacs tips from Ben Maughan. Maughan has a local mailing list to which he posts an Emacs tip every week. Happily, for the rest of us, the list is available as a Web page too.
A lot of the tips are elementary but I learned a couple of things so it's probably worth your while to cycle through them. Or you could extend the pleasure by reading one a day. Either way, the tips are short and to the point so you won't waste any time.
I'm glad Malabarba pointed us to the list and I'm grateful to Maughan for making it available to all of us through the Web site. Now if I could only figure out a way to get on the list.