I've linked RakNet to dev-c++ and finished the RakNet tutorial for creating a client/server chat aplication. When I finished that I wanted to get into RakNet more in depth, but the chat tutorial is the only tutorial in the RakNet manuel. Does anyone know where I can learn more about RakNet. (The comments in the .h files arn't enough.) Thank you for your time.

There is more in the manual than just the tutorial.

http://www.daveandrews.org/articles/irrlicht_raknet/
it has some info on RakNet.

The RakNet source includes a huge list of samples, showing all the librarie's features.

This course might interest you.