If you want to make money writing books,then you need to make sure that your book sales go on for years. The question though,is how do you do that? How do you make sure that you can keep on selling copies of your books for years to come? The answer is simple. You need to write more books that your readers want to read. And it doesn't matter if you're writing fiction or non-fiction . The advice I'm going to give you works for both. What you need to do is not just write a book,but write a series of books. That way,once someone has read your book,they can come back for more. The first thing you need to do is plot out your series. Then each book you write has to be a complete book in itself (needs a satisfactory ending or conclusion) plus it needs to keep your readers hungry for more. If you write fiction,then it's easy to write an ongoing saga split into a series of books,just like the Harry Potter novels did. Each one was a book on its own,but at the same time,t