The Study Design 101 is design to help you understand the different kinds of studies and each studies strengths and weaknesses.
Levels of Evidence Pyramid created by Andy Puro, September 2014
Before using a web site look at the URL (web address) to identify the producer of the web site, and its purpose.
Look at the last final syllable in the domain name to evaluate who produced the site:
.gov = Government agency
.net = Internet Service Provider
.com = Commercial site
.edu = Higher education
.mil= Military site
.~ = ("tilde") Personal
.org = Organization