Media is biased because we all have biases. It's important to read widely and check yourself and your assumptions. These sites all have strategies and suggestions.

Practice becoming a Lateral Reader: verify what you're reading as you are reading it. 

Leave the site and open new tabs to judge the credibility of the original site.

  ♦  search for the site/article on fact-checking sites

  ♦  search for the owner or publisher of the site

  ♦  follow references back to the original sources

  ♦  research what other sites say about the source