"The Non-Designer’s Design Book" explains how anyone, even without a design background, can create professional-looking designs by following a few basic principles. She introduces four key design principles: Contrast, Repetition, Alignment, and Proximity, which help make layouts look clean and easy to read.

According to the author, contrast makes important elements stand out, while repetition creates consistency throughout the design. Alignment ensures that everything is neatly placed, and proximity helps group related items together, making the design more organized and intuitive for the audience.

The book is practical and filled with examples that demonstrate how these principles work in real designs. Williams encourages readers not to feel intimidated by design, but to embrace it as a skill they can develop with a bit of practice. The core idea is about making things look good while also being functional and easy to understand.