If you do not know anything of chinese, you may take a look here. In English,

https://www.loecsen.com/en/learn-chinese

or in your native language:

https://www.loecsen.com/en/learn-chinese#/vn/C%C3%A2u%20%C4%91%C3%A0m%20tho%E1%BA%A1i%20c%C6%A1%20b%E1%BA%A3n

Thank you, Paco.

I hope everything goes well with you.

How i can exchange with you?

I don't learn in Learning system, so i don't know how i can learn :(