..If you plan to use open/free resources found on the internet for an academic task, question the source and verify the data/information.
..A few tips:
..Authority & reliability: remember to check the "About us" file or "Mission" statement to find out who's running the show and verify that the editor/author/organization has some expertise in the subject being presented.
Consider: 1) whether you recognize the author or know of their reputation; 2) whether you were following a recommended link from a site you know to be trustworthy; 3) whether the author's credentials are listed on the site & can be verified; 4) whether the author supplies contact information where you can obtain more information.
..Credibility: facts presented that cannot be corroborated in other sources you know to be trustworthy should be treated as suspect.
..Bias: not always obvious. Everyone knows that a 'dot com' is a commercial site that is probably trying to sell you something. But people, organizations, governments, and other entities also "sell" ideas: believe our story; see it OUR way; these are The Facts (or at least the ones WE like and we'll just ignore the others). Be aware that persuasion and advocacy are forms of bias: even worthy organizations like the American Cancer Society are trying to persuade you to their way of thinking.
When searching in Google, consider adding "site:edu" or "site:gov" or "site:org" to restrict your results to colleges & universities, or the US government, or non-commercial organizations, though not all "dot org" sites are non-profit organizations
This video produced by UMass Dartmouth Library, Evaluating Internet Sources, presents a more detailed strategy for evaluating the usefulness of web resources for your academic research.