Always evaluate your sources, in life, and particularly in this course.
For this course, there are 6 criteria in particular that you should pay attention to.
Authorship: How appropriate is this author for the topic?
Accuracy and citations: Do scholars agree with this source? Does it cite quality sources?
Content: How does it present the topic? Is it advanced or basic, does the author show different viewpoints?
Currency: Is the site up to date on advancements in the field?
Purpose: What is the purpose of this site? Is it to inform, to perusade, to advertise?
Style: Is it well put together or does it appear haphazard?
Now, these are not aways cut and dry. For example, if there is a new breakthough in the field, other scholars may not initially agree with the new findings, and you have to take that into consideration.