Always cross-check your sources with other professional, reputable sources
Beware of inflammatory or attention-grabbing headlines/language. This language is intended to get more "clicks" and thus more revenue from advertisers.
Do a background check on the author, scientist, website owner, organization associated with the website, article, etc.
Check the publication date for relevancy
If the article pertains to a specific study, read the original study and/or see what other experts in the field are saying about the study.