SIFT is a helpful acronym for initially evaluating source credibility. SIFT (from Mike Caulfield) stands for:
Modified from Mike Caulfield's SIFT (Four Moves), which is licensed under a Creative Commons Attribution 4.0 International License.
Later, when you determine that the site is worth your time, you can analyze the source's content more carefully.
There are numerous ways to "SIFT" (as described above). 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.
(Adapted from “Four Moves,” Web Literacy for Student Fact-Checkers, Mike Caulfield)