When you find information on the Web, you need to be especially careful about evaluating it. You will need to check whether it is reliable and appropriate for your school work.
Here's a quick guide for evaluating Internet resources.
When was this site last updated? Look at a few documents on the page—can you tell when they were written?
How important is this to your topic?
What is this site about? Is it easy to tell? What is the scope of coverage (broad, narrow, etc.)
Who do you think is the audience for this information?
What person or organization is responsible for this content? What are his/hers/their credentials?
What makes the author(s) an authority on this subject?
Is the information on the page supported by evidence of some kind? Does the information include references to sources?
Are there spelling, typographical, or grammatical errors?
Who is the intended audience for this information? Is the site selling something, like a product or an idea?
Look for the site's mission statement or About page to evaluate the information's purpose.