There are numerous ways to "SIFT." These "four moves" from Web Literacy for Student Fact-Checkers will help you "SIFT."
When you first come across a web source, do a quick initial assessment, much like a fact-checker does. Fact-checkers don't spend too much time on a website; instead they quickly leave that site to see what others have said about the site.
(For example, get other information about a website from other sources by searching Google for [WEBSITE URL] site: -[WEBSITE URL]
(Adapted from “Four Moves,” Web Literacy for Student Fact-Checkers, Mike Caulfield)