Build your own profit business, no matter how small it is, as earlier as possible.
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But of course then you really need to do the business first, and right, and the coding comes second.
If you plan to go down this route I recommend exposure to accounting either at school or college (or via external self study.) I did it at school, and while I'm not involved much in accounts these days, being able to read them, and understand them, is really useful and important.