[mhomde]

There are tons of articles and books on design. In the same way you build your toolbox with programming with algorithms, concepts design patterns, best practices, you need to build one for design. Ergonomics, color theory, typography, ergonomics, Fitt's law etc etc. Then work on applying them until you develop and intuition for what's the best solution to a problem.

With design, maybe more so than with code, it's a lot about developing good taste. Code can be empirically worse or better but design is a lot of having a point of view and working within self imposed constraints.

One book I'd really recommend is "The inmates are running the asylum" by Alan Cooper. It's more about shifting how to think about design rather specifics, but it's one of those books that puts a voice in your head that will help guide a lot of decisions.