> Jumei Guide: Cao Le, graduated from Tsinghua University, joined Didi in early 16 years and led the team to build Didi online ride-hailing technology system, He is currently the head of Didi’s ride-hailing technology department. Faced with the confusion of the growth of the technical team students, Cao Le wrote a letter to the students, he clarified his insights and ideas from various dimensions, helping the students to no longer limit themselves to looking at problems from a technical perspective, but to have a broader vision and methods. He put forward the following ideas around the topic of how to become a technical powerhouse: finding paradigms, deliberate practice, timely feedback; Vertical penetration, lateral migration, deep review; Smart people have to work hard. I would like to share the contents of this letter with you again.