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

This is probably a very naive question so sorry about that.

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.