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!
Assess: Does this information belong in my academic project or is it .... CRAP?
Is the information fact or opinion?