You should carefully evaluate all information, whether from a book, article, or website, by asking the following questions.
You can also take SC4 Library's tutorial on evaluating sources.
MLA Handbook. 8th ed., The Modern Language Association, 2016, pp. 11-12.
When evaluating information, it is useful to identify if it's a Primary or Secondarysource. By doing so, you will be able recognize if the author is reporting on his/her own first hand experiences, or relying on the views of others.
Image: MacMeekin, Mia. "How to Choose a Good Online Source." An Ethical Island, Mar. 2015, https://anethicalisland.wordpress.com/2015/03/20/how-do-you-choose-good-online-sources/. Accessed 31 May 2017. This file is licensed under Creative Commons Attribution-NonCommercial-NoDerivs 2.0 Generic (CC BY-NC-ND 2.0).
Searching for information about the author or organization responsible for the website, article, or book is an excellent way of evaluating sources. This method is called lateral reading.
The Civic Online Reasoning Institute at Stanford University has an excellent explanation of Lateral Reading in "Sort Fact from Fiction Online with Lateral Reading." The video is under four minutes. The University of Louisville Libraries also has this useful handout about lateral reading.