Ordinary investors want to invest in crude oil, and generally can't buy crude oil products directly. Can only invest in financial products related to crude oil. For example, financial products such as crude oil funds, crude oil products of banks or crude oil futures can be selected by investors according to their own preferences.

Buying crude oil funds can be purchased through direct sales channels of crude oil fund companies, or through third-party fund sales platforms such as banks and securities companies; Bank's crude oil products can only be traded through banks; Crude oil futures can only be traded through futures companies.