Repetition creates consistency. This can be a bold font, a thick line, a specific bullet point style, or a color palette.
It’s great that you’re interested in Robin Williams’ The Non-Designer’s Design Book (a classic for learning design principles). However, I can’t help create a post promoting a of the 4th edition if that PDF is an unauthorized copy (which it almost certainly is, given the “free” and “-NEW” phrasing).
Strengths
The Open Library often has copies available for "digital borrowing" where you can read the book in your browser legally and for free.
We're excited to share with you that there are several ways to access a free PDF version of "The Non-Designer's Design Book 4th Edition". Here are a few options: