You need to ensure that you're using the highest quality sources of information for your academic work. As you gather information for your research project, you'll look at many different sources: books, articles from databases, Web documents, interviews, videos, and more.
You can feel pretty confident that books you get from the library and articles you find in the library's research databases are reliable and credible because you know those have gone through a traditional editorial process; someone or some group has checked all the facts and arguments the author made and then deemed them suitable for publishing. You still have to think about whether or not the book or article is current and suitable for your project but you can feel confident that it is a credible, reliable source.
When you use sources from the Web there often is no editor. It is your job, then, to evaluate those Web sources to make sure they are reliable and useful. Remember, the first source that comes on from your search is not necessarily the best source to use for your research. It is up to you to be a knowledgeable consumer of information.