Note my corrections to your question above. We don't start questions with "How to". Also, I have changed your thread title so that it includes the entire sentence.
There is no simple answer to your question. I have moved your post to the General Language Discussions, where you will get more responses once we know more about your current level and method of study.
I find that reading a lot of books from noted authors helps a lot of my students improve their grammar. So I would suggest finding a book or author that you like and try to read as much as possible.
Actually, reading anything a student thinks is interesting or entertaining should work. The writers don't need to be noted as long as they fulfill your "book or author that you like" criterion.