how does the stock market work

How do you buy stocks and can a company run out of stocks to sell? Also, how can they determine in seconds how a stock goes up or down?

I dunno

https://lmgtfy.com/?q=how+does+the+stock+market+work

it works?

You put in all your money and then lose it.

It's like a Ponzi scheme but only seemingly more complex.

Or better yet, a gifting scam.

I never gonna put any of my cash into this market.