ABOUT MYSELF

Hi guys, my name is Tanya, I am from Russia, I am learning English and I want to know this language perfectly

ABOUT MYSELF

hi guys, my name is Tanya, I am from Russia, and I am learning English and I want to know this language perfectly

Corrections in red.  Stylistic suggestion in blue.

You used the right words, but you wrote one <em>looooooong</em> sentence which needs to be divided and punctuated.  Here are a few possible ways:

Hi, guys.  My name is Tanya.  I am from Russia, and I am learning English.  I want to know this language perfectly.

Hi, guys, my name is Tanya.  I am from Russia, am learning English, and I want to know this language perfectly.

Hi, guys, my name is Tanya.  I am from Russia.  I am learning English, and I want to know this language perfectly.  

Because you start very informally ("Hi, guys"), it would be better to continue writing informally by using contractions.  That is, you could say, "My name's Tanya," "I'm from Russia," and "I'm learning English."