During the process of conducting e-commerce, what thorny issues will you encounter, which problems are the most severe, and what are the solutions to these problems; what are the most effective online marketing methods, and how can you scientifically quantify the results of your online marketing; how do you evaluate the performance of your e-commerce, what is the scientific basis for it, and how can you continuously improve your website's performance; how do you choose an online marketing service provider.