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 steps used to evaluate information sources. This an abbreviated version, for more information and guidance check out Chapter 2.9 "Evaluating Information Using SIFT" of the Library 160 textbook.