Break up pages into clearly defined areas; it allows users to decide quickly which areas of the page to focus on and which areas they can safely ignore. Users decide very quickly which parts of the page have useful information and then almost never look at the other parts—almost as though they weren’t there.
Don’t make me think
Being an expert in online usability Krug gathered his experience in a wonderful book. This summary of key thoughts will help you to remember most important principles and laws.