Keep the necessary and remove the fat

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I remember when I read the story that Jason Friend told about their book Rework when (I am paraphrasing) remove all the fat from the the draft to the final version of the book. Their editor not necessarily agreed, but that decision, make their book simply remarkable and incredible.
Last weekend I read a book that I was actually looking forward for a really long time, and two third of the book were incredible, then the author continue writing to the number of words the editor need to sell this book, and that last one third, was poor, I should say bad, pure fat.
As a writer, I have been in the game of words, you need to write a number of words in order to be able to call your book something, and after read this other book, I decide that my books and stories will had the long of the story. After I finish I will remove the fat, and make it with only the necessary stuff, to make it more close to remarkable.
For now own, in my own writing I will Keep the necessary and remove the fat…