What exactly is a stock?

Buy low and sell high.

Listed companies issue stocks, and others exchange money for stocks.

So listed companies use this money to do business. When you make money, the stock price goes up. You can also pay dividends.

That's what long-term people think.

Short-term is bought in 5 yuan, and 6 in 5 yuan. Go back and forth like this.

Investment experts just come and go to make money. The difference is that you make a profit today and lose money tomorrow. In the end, the whole is a loss.