How Taobao/Paipai online stores promote their businesses after sales

I bought a piece of clothing online the other day. After receiving it and opening the package, I found a sheet inside, similar to a supermarket flyer but not as large - about the size of an A4 sheet. It showcased some of the best-selling items, promotional activities, contact information, and website URL of the shop. At the end, there was a form for returns and exchanges. My first impression was "professional"!

I had heard someone introduce this method of online store promotion after-sales before, but I've never actually put it into practice. Thinking it over again today, I feel that this store-opening experience is still worth learning. This method has at least three advantages: