Hi, probably my question will surprise you but please help me.

I`M really new in EXCHANGE but I have to learn it, which is the basic knowledge that i have to had to start ? Thank you in advance!!!

Hi neshev,

Here is a link to help you get started:

https://technet.microsoft.com/en-us/library/bb124558(v=exchg.150).aspx

Take a look at the study material for the MSCE Exams, they'll be pretty helpful.

https://www.microsoft.com/learning/en-us/exam-70-341.aspx?c=us

https://www.microsoft.com/learning/en-us/exam-70-342.aspx?c=us

As well as the MVA 

http://www.microsoftvirtualacademy.com/product-training/exchange

You can also check out some books 

http://www.amazon.com/Mastering-Microsoft-Exchange-Server-2013-ebook/dp/B00GDEP1GA/ref=sr_1_1?s=digital-text&ie=UTF8&qid=1432214535&sr=1-1&keywords=exchange+2013

I would also hit up google and read some blogs, like the Exchange Team Blog, msexchange.org, msexchangeguru.com.