Ask yourself:
Think about the following aspects. If you can't figure out any of these, that's a sign to dig deeper into the source, and maybe open a tab to use a search engine and find out more about the publisher, author, or topic. See the box below about fact-checking for more info.
Fact-checkers work in journalism to correct errors in the news. They are usually hard at work behind the scenes in mainstream media, particularly newspapers and magazines, investigating the work of journalists to make sure an article accurately reflects the facts before it is published. In recent years, online fact-checking organizations have popped up to counter the spread of misinformation facilitated by the internet and social media.
When you are reading a document and want to make sure it's credible, do as a fact-checker does and read laterally: Open a new tab in your browser and search for the publisher/website, the author, the facts of the story.
The Google Fact Check Explorer collects fact-check articles from around the world. Search by topic, language, image or publisher.
Reference
Wineburg, S. & McGrew, S. (2017, October 6). Lateral reading: Reading less and learning more when evaluating digital information. Stanford History Education Group Working Paper No. 2017-A1. dx.doi.org/10.2139/ssrn.3048994