The document outlines the C.R.A.P. design principles:
Contrast - Elements that are different should be very different to avoid confusion. Slight differences do not provide enough contrast.
Repetition - Visual elements like color, shape, and size should be repeated throughout a design to develop organization and unity. This includes headings, subheadings, colors, images, and other graphical elements.
Alignment - Every element should have a visual connection to another on the page. Elements can be left, right, or center aligned.
Proximity - Related elements should be grouped together while separate elements should have enough space between them.