The key in any endeavor from which you hope to profit, whether it’s creating a new product, learning a new skill, or starting a new service, is to first identify whether other people want what you are selling.

Contrary to the message in “Field of Dreams” (sorry, Kevin Costner), if you build or create something without first determining whether or not people want it, you probably won’t have anyone knocking down your door to get it.

Learning to be the best Fortran coding expert in the world is useless in today’s workplace because no one uses that coding language anymore. And don’t get upset if you spend 4 years learning puppetry only to find no one wants to pay you for it.

To make a living, you must serve other people. To serve other other people, you must find what people need.

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You must determine what problems other people have and how you can solve them. Perhaps the need is to be entertained (in which case learning puppetry might actually be profitable for you, if you can find a way to market it). Perhaps the problem is a lack of clean water to drink.

Regardless of what you do, the key is to first identify what others want, then create something that serves that purpose. The customer must come first if you desire to profit.