It’s a little-known fact that one of the all-time bestselling writers of westerns lived most of his life in the English market town of Melton Mowbray. JT Edson, who died in 2014, wrote more than 137 novels, most of them westerns, and claimed in all seriousness “never to have even been on a horse”. A former chip shop owner, Edson developed a love of escapist fantasy in his youth, and approached writing westerns just as he later approached writing sci-fi.
The world of the western is about as historically accurate about 19th-century America as the world of the Shire in Lord of the Rings is about pre-industrial England. Both are fantasy worlds, abstracted from reality, crafted by expert fantasists. The pre-eminent western author, Louis L’Amour, loved the mythology so deeply that he began to write novels as a way of escaping into it. Like sci-fi and fantasy authors, writers of westerns, even when their sales stretch into millions, remain at the margins of mainstream culture. So it seems almost inevitable that over time the western and the fantasy have cross-bred.
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Damien Walter 
So you don’t have to write about what you know, but rather about what you imagine you know?
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“write what you know” tends to refer to emotion. Write the kinds of relationship you’ve experienced. Obviously no writet today knew the old west, vmbut many know the genre.
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