(The underlying logic course of e-commerce level 1-7 profit growth (online video course), in simple terms, allows you to master the underlying logic of e-commerce profitability. Only by understanding the underlying logic of e-commerce operations, can you understand: when the performance cannot grow, it is because of this reason! If you encounter difficulties in store operation, you should solve it like this! When the store can't break through the existing checkpoints, you should do it!)