Joshua Thijssen just posted on Speaker Deck the slides for his presentation “15 Pro-tips for MySQL Users“. As the name implies, for the most part, the tips are for more advanced MySQL users, although a couple are the kinds of things I would hope most MySQL users are already doing. There’s plenty to learn here, or at least consider, and it doesn’t take long to peruse. (And, there are actually 16 tips.)
Once you’ve gone through that presentation, you may want to consider some of the others that Thijssen has posted on Speaker Deck. In particular, I’d consider “REST in practice” and “Alice & Bob: public key cryptography 101”.