Who is the author of the source? Are they an expert?
Check the author's affiliations. Are they active in the scholarly conversation? Google the author.
What is the purpose of the source? Why was it created?
Consider the type of source. Check for bias.
When was it created and has it been updated?
Does your topic require current information? Could the information have changed?
Where can the information be verified?
Check the references and follow the links.
Why would you choose this source instead of another?
Keep the context in mind.
Evaluating Sources for Credibility by NCSU Libraries