Use critical thinking to decide when information is useful, trustworthy, and relevant.
Searching and locating information sources is only one part of the research process. An equally important part is being able to tell if the sources you've located are trustworthy, appropriate, and authoritative.
Source evaluation is along sliding scale; not black or white, good or bad. While there are some sources a majority will agree are "good" or "bad" most information falls somewhere in between these two extremes.
SIFT is a helpful acronym that describes four steps that can be used to evaluate information sources. This version on this page is a short overview that can be used for quick reference. For the full version, and for more information and guidance about how and why to evaluate information sources, see the Chapter 4 of the Library 160 textbook (open access).