[CentOS] OFF TOPIC. The best course of CentOS in USA

I would like to know which all of you point me as the best training 
course of CentOS in the world or in the USA. I am a Brazilian and I 
would like to have this information. I have a good background in 
GNU/Linux, CentOS and Debian like operating systems, network and general 
knowledge. I would like to know a deep course about all this subject. I 
would appreciate any kind of information in advance. Thanks all!


-- 
Edson D. Amaral
---------------
Listen to the voices inside of you, they will tell you what is right and what is wrong, they will bring you happiness and peace; if you don't listen to them they can create anxiety, discontentment, and unhappiness.
Ouça as vozes dentro de você, elas vão te dizer o que é certo e o que é errado, elas vão lhe trazer felicidade e paz, se você não ouví-las, elas poderão criar ansiedade, insatisfação e infelicidade.

Bert Wilson

The Five Secrets you must discover before you die, pg. 155