.com - Commercial site meant to make a profit. Information may be true, but it may not give you the full story. 

.edu - Educational institutions, generally viewed as credible. Student personal websites under the server are not monitored consistently, therefore should not be used as a resource. 

.gov - Governmental institutions, considered to be credible sources. 

.org - Non-profit organizations, generally seen as credible and unbiased. That being said, some advocate for specific views so it should be looked at with scrutiny. 

.mil - Military institutions for the Armed Forces of the United States. 

.net  - Any sites that do not fit into the above category. These must be viewed with scrutiny.