You are trying to determine whether the information resides on a personal or an official Web site, first, and then to evaluate the official site and the authors purpose and credentials. Remember how easily anyone can publish on the internet. At present, most websites exist without standards to ensure accuracy. Remember, though, that the dates may mean date of authorship, of revision, of posting on the web. Appropriateness becomes an important issue when we consider access to minors.
Depth is always critical to research.
It becomes important, then, to determine whether a page is arranged effectively to enable efficient use.