JESUS did many other miracles before His followers that are not written in this book. But these are written so that you can believe that JESUS is the Christ, the Son of GOD. Then, by believing, you can have life through His name. (John 20:30-31).
There are many other things that JESUS did. If every one of them were written down, I think the whole world would not be big enough for all the books that would be written. (John 21:25)