Documentation for Fake News Fitness 2.0 can be found here: docs.fakenewsfitness.org
Look at the URL first (the address of the page you found). What does the domain name tell you?
Domain Name = Domain + Top Level Domain
A domain name is a domain, and a top level domain (TLD). For example, the domain name scientificamerican.com says "this is the scientificamerican domain, and we are a COM - a commercial site funded by selling things.
Top Level Domains and Implications
Subdomains and Pseudo-Domains
The beginning of a URL can include a subdomain, If you saw "www.scientificamerican.com" then WWW is the subdomain, which can generally be left out. But blog.scientificamerican.com, then this would be the blog site associated with Scientific American, and you could trust it.
Fake news sites often begin with a pseudo-domain as the subdomain -- a subdomain pretending to be a domain. Scientificamerican.wordpress.com has a pseudo-domain and should not be trusted, but blog.scientificamerican.org can be. If the domain name ends in “.wordpress.com” or “blogger.com” these are personal blogs rather than news sources.
If slight variations of well known websites appear, such as “.com.co,” this is usually a sign that the website is fake version of a source. However, remember that foreign reputable news organizations may have these country-specific domains. For example, ox.ac.uk means Oxford University in the United Kingdom.