You can even compare a webpage to other webpages to check the consistency and depth of the information. As you gain a basic knowledge of the subject you are researching, it will be even easier to sort through, find, and organize the usefulness of a webpage. In addition to having good information, it is very important to have the information well organized and easily understandable. If the information is not understandable, it becomes completely useless. There are many effective ways to organize information.
Some sites use topical divisions, some use time lines, depending on the subject.
Other sites may use outlines to organize their information. For a good example of a well-organized webpage, check out Buddhism Depot. It is organized in an outline fashion and explains the origins and aspects of Buddhism concisely and clearly making it easy for the viewer to understand. The site fLip's Buddhist is a wonderful example of a visually pleasing page. The use of graphics is very effective in drawing people's interest and it really adds to the page.