1. To choose an online brokerage firm and invest in US stocks, you must first choose a suitable US stock brokerage firm. When choosing a brokerage firm, we mainly look at factors such as commission, word of mouth, minimum amount requirement, convenience of operation and service.

2. To open an account in a US stock market, it is generally necessary to fax or send a scanned copy to the account opening code or email address designated by the brokerage firm for approval.

3. Exchange foreign exchange and remit it to the trading account. With a trading account, it is necessary to start preparing foreign exchange funds. At present, Chinese mainland residents have allowed individuals to exchange foreign exchange. They can go to the bank with their ID cards, and each person can exchange up to $50,000 a year.

Short selling, also known as short selling and short selling, is an operation mode in the stock and futures market, which refers to the trading behavior of the third party borrowing and selling stocks.

Contrary to buying low first and then selling high, shorting is to profit from the decline of stock price, and the order of operation is to sell high first and then buy low. When the market is expected to fall in the future, investors can sell the stocks they borrowed at the current price, buy them after the market falls, and then return them to get the difference profit. Because the short-selling stocks are borrowed, short sellers will eventually buy the same stocks for the same amount and return them to the stock lenders. This behavior is called cover.