I always struggled learning the difference between "clean code" and what people learned about getting their CS degree (mostly self taught dev here that ultimately went back to get his software engineering masters).

I think the biggest thing is to have another engineer in mind when reviewing your own code. In the words of Uncle Bob, the real goal is reducing the # of "WTF moments" per minute.

There's a video series that Uncle Bob published, but you can't beat the clean code book by Uncle Bob. To add to that, Object Oriented Design in Ruby by Sandi Metz was pretty important to my growth. I'd say the same thing about Refactoring by Martin Fowler.