(In the e-commerce design, the main product map and the through train promotion map are the most important entrance map. "Consumers click in or click in to see the product details page" depends on them! The main drawing and through train diagram of the product seem simple, but it is easy for designers to have no way to start. They spend a lot of time but can't get eye-catching effect. In this course, the left-hand design theory and the right-hand business case practice will systematically explain the design ideas and methods of e-commerce main diagram and through train diagram.)