Notice that for both examples below, you may not know much about the sites' authority / credibility by looking at the site content itself. If you are not familiar with a source, you can try searching the publisher / source and see if other (reasonably) credible sources are linking to / referring to the site.
Pay attention to context here, too. Reputable sites may mention unreliable sources when reporting on things like hoaxes or viruses!
Maybe it was easy to find, but is it good?
Assess: Does this information belong in my academic project or is it .... CRAP?
Is the information fact or opinion?