Independent Fact-Checking sites for Fake News stories:
Use the same practices professional fact-checkers use:
https://www.npr.org/sections/alltechconsidered/2016/12/05/503581220/fake-or-real-how-to-self-check-the-news-and-get-the-facts
How to check a website for false or misleading information:
https://youtu.be/Fm0LwscDYHs
Also from FactCheck.org, a graphic on how to detect manipulated images.
https://www.washingtonpost.com/graphics/2019/politics/fact-checker/manipulated-video-guide/?noredirect=on&utm_term=.3f2584f454b6