Write the synopsis -- traditional publishing
This is a tough one. If you have never been published before or sometimes even if you have, for a fiction book, you’ll need to have a synopsis of the book. Often submission guidelines will specify how long a synopsis they want. It could be one, two, five or ten pages. Let me tell you, it is hard getting a 300 page novel condensed into five pages. Most writers find this extremely difficult and there is much weeping and gnashing of teeth over this project. But it must be done if that’s what the agent/editor wants. In non-fiction the proposal usually includes a synopsis of the book. Again, go by guidelines.