Connection first, content-oriented, cooperation is the most important. According to Sohu News Network, the "three C" concept of the national education digitalization strategic action is connection priority, content orientation and cooperation priority, and "connection priority" refers to strengthening the connection and sharing of educational information infrastructure; "Content-based" refers to the continuous development of high-quality educational resources; "Cooperation is the most important" refers to the construction of the application ecology of educational informatization.