I suggest you read the non-designers design book. A lot of it is pure math - colors, alignment, contrast, repetition, and proximity. Even if you won't learn how

I suggest you read the non-designers design book. A lot of it is pure math - colors, alignment, contrast, repetition, and proximity. Even if you won't learn how to design you will learn to tell good design from bad, and what makes it so. Stay away from Kindle version though - in a twist of irony the book's layout has been severely corrupted, serving more as an anti-example to its own content.