Book: The Non-Designer's Design Book
AI can now quickly generate web pages, posters, presentations, and all kinds of visual drafts, but "being able to generate" does not mean "looking good." What many works lack is not tool capability, but the human ability to judge where things are loose, where they are cramped, and where there is no focal point.
The value of Robin Williams' book lies precisely here: it does not require you to first become a professional designer. Instead, it explains foundational principles like contrast, repetition, alignment, and proximity in an exceptionally clear way. After learning these principles, when you use AI to create visual work, you will find it easier to articulate what you want to change, and easier to see why a particular image or page feels off.