When deciding whether to use a source, you should consider its credibility, relevance, and appropriateness--that is, is the information reliable? Is it relevant to your argument? Is it an appropriate type of information to reference in your work?
There are many ways to think about that process. The important thing to remember is that evaluation is a spectrum, and you need to be able to stand behind your sources--ultimately, the decision is yours.
Evaluation is about asking the right questions and using the C.R.A.A.P test of evaluation is just one way to review and assess the quality of your sources. Do your sources pass the CRAAP test? If not, find a better source!
Don't stop at evaluating your sources! Evaluate where your own unconscious and conscious biases lead you to favor one source over another.
Consider CONTEXT when assessing credibility.