As you surf you will find many different layouts made up of 4 parts: a header, a navbar, main or body, and a footer. The best layout for your pages depends on the purpose and the content and which page you are designing. An index page is often laid out and designed differently from the other pages. Often it is a splash page with a navbar. Other times it is primarily a navbar with an explanation of how to use the site.
What you see here is only a demonstration of the basic layouts and certainly not the only ones to be used. How you lay out a page is only limited by your imagination and should be dictated by necessity.