(In e-commerce design, the main product image and the through-train promotion image are the most important entrance images. "Whether consumers click to enter, and whether to click to see the product details page" depends on them! The main product image and through-train image may seem simple, but it is easy for designers to get lost and spend a lot of time without getting an eye-catching effect. In this course, the left hand design theory, the right hand business case operation, systematically explain the design ideas and methods of e-commerce main map and through train map.)