In school you mostly learn about how to pass tests.
But you don't really learn how to do stuff.
In business school for example, you don't really learn anything about starting, managing or growing a company.
What you do learn though is how to pass tests on business related subjects.
Just like you don't really learn how to properly speak a language in a language school.
You mostly only learn how to pass tests in that language.
Just like you don't really learn programming in school.
And instead you mostly learn how to pass tests on programming.
So if you really want to learn something, you've gotta go out there and do it.
Over and over again.
And you've gotta get your hands dirty.
And see what works and what doesn't.
Which is rarely the stuff we're taught in school...