I really enjoyed and got a lot out of Final Cut Pro X 10.3 and 10.4 Essential Training by Ashley Kennedy on Lynda.com. It’s really well done and has a bunch of really useful information in it.

I particularly enjoyed learning about color correction, how to use various scopes (Luma Waveform, RGB Parade, and Vectorscope) to get things looking good.

Here is a shot before and after color correction: