To begin with, a purchase should ensure the supply of goods: Keep track of the sales status of goods in each product department to prepare for the supply of goods. Secondly, prepare commodity procurement plan on a regular basis (usually half a month or a month as a cycle), including the selection of key commodities, commodity prices, quantity, supplier selection, etc. Lastly, Assist in training selling staff, let them understand the performance and characteristics of the products, master certain product knowledge, and promote product sales.