There are a number of ways to approach evaluating sources.
Evaluation Criteria
Authority -- Accuracy -- Objectivity -- Currency -- Coverage
I. Authority:
Is there an author?
Is the author an expert?
Is the sponsor well-known? Reputable?
Is there an About Us? What does this tell you about the quality of the information on the site? If you can't find an author or a sponsor, how can you figure out who is responsible for the site?
II. Accuracy:
Is the information accurate and error-free?
Does the site provide a list of sources OR tell you where the information comes from?
Does the information match what you already know?
III. Objectivity:
Is the page clickbait? Is it designed to sway opinion?
IV. Currency:
Can you find a publication date on the site? Is the information current enough?
Do the links on the site work?
V. Coverage:
Is the topic explored in depth? Does the information seem too general?
(with thanks to Susan E. Beck, New Mexico State Library, and her site The Good, The Bad, & the Ugly, or, Why It's a Good Idea to Evaluate Web Sources.)