The Tanya is called by the Alter Rebbe Schneur Zalman of Liadi the book of the beinonei. This is a Jewish word meaning the intermediate one. This is a step lower than the righteous one a Tzadik and higher than the animal soul which we all have.
This book is for everyone. This is the average man who like me who has to struggle to achieve righteousness.
The Tanya is a book of lessons and teachings based on the Talmud, Torah and Kabbalistic concepts for us (me too) to get closer to G-d so we(I) can live a G-dly life.
When we(I) fall short of the target we (I) must do t’shuvah which means turn from sin and turn back to the source G-d Yeshua.