(As we all know, the future is a world of data. No matter you are an operation and maintenance personnel or a code farmer, if you don't understand data analysis in this world, you will be eliminated! And I believe you have felt the changes around you. Many industries have eliminated a group of practitioners who do not understand data. New retail will become a fatal poison for many people, just like today, when you suddenly find out that you don’t need to bring cash when you go out, many people will be caught off guard!)