Who is the author? Are they experts in the subject?
Can they be contacted?
What is the purpose of the source?
To inform? teach? sell? entertain? persuade? Which of these might be most valuable to you as s source? Do you think a website trying to sell you nutritional products might "spin" their argument in favor of what they sell? Probably so, and that's not great. If an article is trying to teach you something about black holes, might that be more believable? Of course!
Fact or opinion based?
Are the claims/conclusions supported?
Why would I use the source?
Why is the source reliable?
Where did you find the info?
Where does the money come from?
When was the info created or updated? Does it matter to you if it's current?
Has new research been done?