You have to be just as careful and critical of well known news media outlets as well.
Below is a chart evaluating media outlets for quality & partisan bias.
Visit this page for an interactive media chart.
Is it newsworthy? Should you share it?
With an understanding of fake news, misinformation and media bias, you are better equipped to determine if something is credible and newsworthy. Following this page are links to online checkers and a couple cheat sheets to help you evaluate any news story, news item, claim or quote.