The so-called inventory is to count the goods. First of all, when you buy goods, you should make a good record. The quantity and amount of goods are divided according to types. Record it when you sell it, so that both the incoming and outgoing goods are recorded. When counting goods (inventory), just click on the remaining goods. If the difference between the rest and the price difference in and out is inconsistent, it means that you made a mistake when you usually sell things. The inventory is mainly to see if there is a difference.