How do I write a book and sell it?

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A) Learn to write great books.

Also, if you write unreadably terrible books, barely readable books, halfway adequate books, or even good books, they won’t be great books, as specified by your question.

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How to unfailingly write a great book and sell it in three easy [well, not that easy] steps:

—Read one thousand novels attentively, paying attention to them so that you develop the artistic judgment to know which ones are better than the others and why.

—Learn enough about description to write adequate, preferably good, descriptions.

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—Sit down and write a novel you love that is as great as possible.

Original Question: How do I write a GREAT book and sell it?

—You accumulate multiple books that are great, but that your agent can’t place with publishers.

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Nothing in (B) is under your control except the quality of the book and the quality of the query letters.

If you write unreadably terrible books, then no one will buy your books because people only buy books they actually want to read, and that’s the way THAT is, period, so there’s no point looking for a way to fool people into buying your book when no one sane would ever buy it.

C) Self-publish, and for this to work, you must do each and every sub-step below, and none of these steps are optional:

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Now that you’ve done step (A), you are ready to go to step (B).

The only way to write great books is to learn to write great books. There are zero shortcuts by which to skip this step.

If (B) doesn’t appeal to you, go to (C).

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The most common method for achieving step (A) is to follow these sub-steps:

However, if you want a career as a novelist, you’re going to have to write a whole lot more than three books per 20 years. In traditional publishing, one book per year, or even one book per two years, can be adequate.

You can’t build a career by writing ONE great book, unless you’re Susanna Clarke, and given that she’s written just three books in twenty years, she doesn’t have what you’d call a career as a writer. She does have fame, at least in a small way, and if she wrote any more books, they would certainly sell. Who knows, maybe someday she will.

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—You decide you’ve built a sufficient readership to strike out on your own.

—Put enough time and/or money into promotion that some number of readers become aware that your books exist. This can be a slow build, but if you do no promotion, then readers will not buy your books because they won’t know your books exist, and that’s the way it is.

—Learn enough about covers to get or make adequate covers.

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However, traditional publishers can certainly give you a boost, plus editors at traditional publishers are generally, in my experience, pretty good at editing.

Also, if you go for (B), you should be aware that you are probably going to want to transition to self-publishing eventually for one or more than one of the following reasons:

There is no way around step (A), sorry. If you are hoping for a shortcut, nope, there aren’t any. Therefore, if you want to write great books, you are going to have to learn to write great books.

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—Write multiple books, ideally more than one per year, unless the income from writing isn’t especially important to you, and then it doesn’t matter.

B) Learn how to write good query letters and query fifty legitimate, non-scammer agents, ten at a time, until an agent offers representation.

—Learn enough about formatting to make the interior of your book look like a normal book.

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—You get fed up with the crappy job your publisher is doing with your books.

AND

—Your publisher drops you because your books don’t sell.

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The only way to sell great books is to write great books.

—Also pay attention to which ones you actually love the most.

Then cross your fingers in the hope that the agent will be able to place your debut novel with a Big Five publisher and cross your fingers some more in the hope the publisher will actually market your book somewhat adequately and/or a BookTok influencer or somebody like that will pick it up and rave about it.

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—Repeat, writing another two to ten novels, until you have learned how to write great books.