Ask HN: Where did you learn about stock market/startup economics?

In the startup world, you come across terms like equity, shares or vesting very frequently, like when you're reading how Steve Ballmer got rich.

I've got a vague sense of what those terms mean and I feel like I don't understand a lot of what everyone knows, like I have no idea how to talk about equity/stock options if I get a job, or how do they relate to other things, or how the whole stock market works. Let's just say I have zero knowledge of economics.

So where did you learn about it? I'm looking for resources which teaches you only the essential stuff. In depth resources on are also welcome.