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1. Check the domain. If the site is supposed to be a site about education, does the domain address end in .edu?
2. Read the "About Us." Is there contact information, as well as a clear detailing of who is responsible for creating and updating the site?
3. Check the last update. If the site hasn't been updated recently, it isn't a site from where you want to get information. The date for the most recent update usually appears at the beginning or at the end of the site's home page.
4. Compare similar sites. Check other sites that are supposed to have the same kind of information as the site you are visiting.
5. Use common sense. If the site is supposed to contain education information, for example, but it talks about unrelated things, it makes sense that the site is not valid.
What is How do you determine the validity of a website?