You're not alone!
With so much information available, it's challenging to sift through it all to find credible sources. It's always a good idea to also check with your instructors on how they define "credible" sources. One strategy is to refine your searching to formally published sources, such as books and journal articles, from the PC Library. These materials undergo an extensive vetting process to ensure the credibility of the information.
For books, search on your topic in EBSCO eBooks or Gale eBooks. For journal articles, search in Academic Search Premier or Academic OneFile (Gale).
One Search, our discovery tool that searches almost all of our databases, provides an option to limit your search results to Books/Ebooks and/or Journal Articles.