To develop your skills in evaluating and identifying authoritative resources in the Internet, try this online tutorial
for researching on the Internet:
Care must be taken in searching for information on the Internet. Unlike both the print resources found in the library and the electronic databases provided by the library, freely available Internet resources have not necessarily been published by reputable academic publishers nor have they been selected by librarians with expertise in their subject area. Nearly anything can be posted on a website, and just because it is available online does not mean it is valid or authoritative.
However, this does not mean that you cannot find good resources on the Internet; the key to doing so is to carefully evaluate what you find on the web. If you use web resources, be sure to ask these questions:
CRAAP Test Gettysburg College explains the important of currency, relevance, authority, accuracy, and purpose.
Evaluate Internet Resources UMUC provides a checklist of questions to ask about an Internet resource or any information resource.
Evaluating Web Pages: Techniques to Apply & Questions to Ask UC Berkeley provides a great evaluative framework in a graphically-pleasing chart.
Five Criteria for Evaluating Web Pages A chart from Cornell's Web site.
What's in a URL? IANA (Internet Assigned Numbers Authority) list of generic top-level domain name endings (like .com, .gov).