Ask HN: What did you learn too late in your tech career?

Build your own profit business, no matter how small it is, as earlier as possible.

I did this, so I completely agree with this advice.

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.

Yes I’m sure that everyone can build a for profit business that replaces even the income of a mid level enterprise dev.

Surely you are not suggesting someone work full time and then spend their time off working on side projects? This is the most toxic traits of our industry.