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Things to keep in mind when using websites for your research:
Accuracy-- Is the information accurate? Is it cited? Can it be verified with another source?
Authority-- Who is the author? Can they or their organization be contacted? What are the author's credentials?
Objectivity-- Is the information biased? Is the website trying to sell you something or convince you of something? Does that impact the information presented? Does the information seem different if you look at it on another website?
Currency-- Is the information up to date? When was it published? Do the links work?
Coverage--Is information cited properly? Is all the site's information available to you freely?