So I thought I'd get a job at a big corp, see if I can learn how business works, save up some money, and then start a company. That's exactly what I did, but it was a big mistake.
There's no better (other?) way to learn than to do. And you learn about a hundred times more and faster if it's your business versus a job, no matter how high-powered.
I should've started before I even left high school and simply failed many times. All's well that ends well though!
This is not the case where the "job" is basically an apprenticeship, such as lawyer or plumber or what-have-you.
For one thing, you're only covering a tiny part of the enterprise.
Another issue is you have a performance safety net. Most people coast through life, which is OK, but that's not good enough for running a company.
The most important problem though is that a job has a well-defined path, but in business you can never know what the "right" thing to do is until after you've done it and it either worked or didn't. Having a well-trod path you can follow is a million times easier than starting with nothing and making it all up as you go along.
To quote King George 3 in Hamilton: "it's so much harder when it's all your call."
I think the way to do it is to start a business, inevitably fail, and then just rinse and repeat until you finally figure it out. Easier said than done!
Also compared to a startup there are a lot of departments so you will probably need to do few things outside your job or even interact with people doing unrelated stuff to your job.