There are a couple of people on the internet that I trust their recommendations implicitly. David Sparks is one of them. He has earned that trust through diligence and caring about what he does. He’s never steered me wrong.
Now David and Brett Terpstra have a new training series full of pretty stellar tips for the Mac. I recommend the Vimeo version just because it also works on the AppleTV really well. Plus, I like to download the videos for offline storage.