Two of the purposes of navigation are fairly obvious: to help us find whatever it is we’re looking for, and to tell us where we are and. But equally important what’s here. Also it tells us how to use the site. It gives us confidence in the people who built it. We always think: “Do these guys know what they’re doing?”
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.