Research at the college level is an opportunity to discover something completely new. Unlike Googling or using Wikipedia, using library resources ensures that you will find information that is credible, accurate, reliable, and cites its sources.
Why can't I just use Google?
Try it yourself: ask Google "Is the Earth flat?" Many of the results on the first page are wrong. Google ranks results by how popular they are or how much advertisers pay; it does not show you results based on how true or "good" they are.
Why can't I just use Wikipedia?
Your instructor will likely dock points on your paper if you cite Wikipedia sources. Anybody can write or edit a Wikipedia article. While that brings attention to underrepresented topics, it also helps anonymous people publish incorrect information.
What makes library resources so special?
Library resources had to be reviewed by someone other than the person who created them. These editors or reviewers act like gatekeepers, goalies, or referees; they keep out information that is incorrect or inaccurate.