The following video discusses the idea of lateral reading, or moving horizontally off of a webpage onto other webpages (instead of moving vertically up and down the page), to learn more about the publisher or source. This technique can help you determine whether a page is trustworthy and appropriate for research.
Start with one source you have found on your topic and practice lateral reading:
Look up the organization
Look up the authors
Look up other sources on the same topic
What can you learn about your source that helps you determine its credibility?
Google trick for limiting web sources
Limit your search to a specific website or domain by using the site: technique. Type site: then the name of your website or domain, with no space after the colon. Then put a space and type your search term(s).
Search within a single website = site:nih.gov addiction policy