To sell ETF funds, you must first have a stock account. Opening this account is very simple. I can find a securities company to open it with my ID card. ETF funds belong to on-site funds. On-site funds refer to funds that should be traded on the stock exchange by using the online trading system of securities companies, just like buying and selling stocks. With a securities account, the operation method is basically the same as that of stocks. Investors only need to input the code of ETF, for example, the code of 50ETF is 5 10050, and the code of 300ETF is 1599 19, and they can buy and sell at the real-time price, thus earning the price difference. The minimum trading units are 1 lot and 100 lot.