If you didn’t know this already, the Red Cross is responsible for educating the public about the Geneva Conventions. We do this with free classes held here at our offices — hopefully we’ll get another one scheduled soon.
You can also educate yourself by taking a look at a few of these links:
The Geneva Conventions, the International Committee of the Red Cross and the Rights of Prisoners of War
The International Committee of the Red Cross
Full texts of the Geneva Conventions
Introduction to International Humanitarian Law
American Red Cross Congressional Charter (PDF)