If it is recruited by the manufacturer, there will usually be someone to guide it, and then you will have to practice more by yourself. If you are familiar with it, you will naturally shout it out. As for getting on well with people who promote sales together, if you all work in the same company, it will be easier, because everyone works together, and the increase in sales is beneficial to everyone. If you are a promoter of other brands, it will be more difficult because they are competitors. But don't denigrate other people's products in order to increase your sales. Ordinary regular shops or supermarkets are not allowed to do this, and it is not conducive to the sales of their own products. Instead, it focuses on the advantages of its own products.