Don't Make Me Think, Revisited - by Steve Krug (Author) - premium paperback

Scanning vs. Reading: Krug explains that users don't read web pages like books; they scan them like billboards while driving at 60 mph. Your design must cater to this behavior.

Visual Hierarchy: Important things should be large and bold. Things that are related should be grouped together.

Omit Needless Words: He is famous for saying that you should get rid of half the words on a page, then get rid of half of what’s left. This keeps the interface clean and functional.

The "Trunk Test": If you were blindfolded and dropped deep into a website, you should be able to answer: What site is this? What page am I on? Where is the home button?