There are basically four concepts: futures are commodity contracts, foreign exchange is mainly the exchange rate of currencies of various countries, and stocks are stock certificates issued to investors by joint-stock companies when raising funds. Securities investment fund is an indirect way of securities investment. By issuing fund shares, fund management companies concentrate investors' funds, which are managed by fund custodians (that is, qualified banks) and managed and used by fund managers. They engage in investment in financial instruments such as stocks and bonds, and then share the profits, and of course bear the investment risks.