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By focusing on finding a starving crowd(market), before the service or the product you wish to sell.

Wow so location is key

Not exactly but it’s part of it, you can also use people’s situations (weak points) to sell. For example, if you work in a hospital(not necessary), you can write a book about “How to improve your baby’s IQ while it’s still in your womb”. The pregnancy is the situation/weak point, and no mother wants a dull child, so your product has a high probability of selling out fast. So there are different kinds of market/crowd.

Damn the IQ example is Gold😍😂💯 I get it

Thank you.🙃