Ask HN: Best Resources for Learning UX/Product Design?

As a developer who used to work a lot on SPAs, I always considered myself pretty good at UI/UX (considering "the fold", minimizing clicks, etc.)

However, recently, I've come to realize that I actually don't know a whole lot about the theory or best practices, particularly when compared to the creators of the pieces on dribbble.com or behance.

Are there any books, blogs, or articles that people would recommend in this area?