Taobao Affiliate is a personal promotion, which means that a big V promotes your products and you give him a commission;

Weitao is a platform promotion. For example, if your store has many fans, you post something about your product on Weitao, and then your fans will see it. The more people see it, the more the platform will promote it to more people for free;

Direct Express is a paid promotion. You pay to promote your product. Your product is ranked low on Taobao, but you can use the Direct Express to make your product appear high in the rankings. The money is deducted every time a customer clicks to enter the store.