Factors to look for in evaluating websites include:
Always make sure to look at websites with a critical eye. If you have questions about the legitimacy of a website or its information, try to verify it or speak to a librarian.
Wikipedia describes itself as "the free encyclopedia anyone can edit." Read Wikipedia's ever-growing list of disclaimers--"Wikipedia Makes No Guarantee of Validity." It's not a good idea to rely on the information you find here--you can use it to start your research, but never quote from it in a research paper. It also should never be the only place that you look when you are researching.