Michael A. Caulfield's excellent guide provides numerous tips for fact checking and finding reliable sources of information on the internet.
SIFT, an alternative to the checklist approach:
The idea of SIFT comes from Mike Caulfield and is reused here under a Creative Commons license.
"Check for previous work": Has someone else already investigated the claim?
"Go upstream to the source": Find the original source of the information.
"Read laterally": Once you find the source, “read what other people say about the source (publication, author, etc.)."
"Circle back": “If you get lost, … back up and start over knowing what you know now."
"Four Moves." Press Books,
webliteracy.pressbooks.com/chapter/four-strategies/.
"Evaluating a Web Site or Publication's Authority." Web Literacy for Student Fact Checkers, 2017. Press Books, webliteracy.pressbooks.com/chapter/evaluating-a-website-or-publications-reliability/.