The Theory of Money
Money comes from helping other people get what they want.
How can I tell what other people want?
Sometimes people tell you...through job listings, etc.
Looking at what people buy is a good clue to what they want
Looking at what you want is also a good clue about what other people want.
How can I tell what I want?
Look at what you buy.
Look at what you do.
If you can build something that gets you what you want, there is a good chance that other people will want it too.