没什么大的错误，一些动词形式写错了，单词拼错，有破句，总之我在你原文上直接修改了，请看：

My hobby is reading books.I often read books in my free time.It makes me know a lot.I really enjoy reading and think reading can help me with my study,and I've been collecting all kinds of books

for three years. I have more than thirty books now.Some are outstanding compositions, some are interesting stories, and some are about famous sayings. l want to make a friend who also likes reading. Then we can read together, and l think it will be funny as well.