At some point in our youth, without ever being taught, we all learned to read a newspaper. Not the words, but the conventions. When we know the various conventions of page layout and formatting, it is easier and faster to scan a newspaper and find the stories we are interested in.
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.