Evaluating sources is an important step of the research process. 
The evidence you choose to use for your research should accurately support what you are trying to argue and it should lend credibility to your work. If you cherry pick your sources, or find quotes that "kind of" fit in your paper, that can have the opposite effect.
Check out this short (3:22) video from the University of Kansas (KU) Libraries to learn about evaluating sources for credibility.
When evaluating sources of information 
for accuracy and credibility, there are many aspects of the source that you can consider. One source that might not fit your research question could still be useful to someone else, so it's not helpful to think about "good" or "bad" sources. Most importantly, if a resource is from a trustworthy author or organization and helps you answer your research question, then you have identified a useful source. Please contact your instructor or a librarian if you would like more help!
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