Verifying credibility non-academic online sources
The credibility of the author is very important in determining the quality of a source. Academic publications have their own quality check for authors: in general only scholars active in academia are allowed to publish. And even then only in their own, or a closely related field. Non-academic sources on the other hand lack this quality check: anyone can write anything about everything, especially online.
Exercise Credibility: who is the author?
Exercise What is the credibility of the author?
Related.
Evaluating information & data: Verify credibility non-academic online sources