It is impossible to count. Zhi Zhi app is a learning mobile phone application software integrating reading and learning, and it is a product of the tree of wisdom. Because people are learning the app all the time, it is impossible to accurately know the number of people learning the app. The software has a large number of high-quality video courses, including thousands of high-quality courses such as literature, management and history. Support cross-school and cross-regional teaching and real-name authentication. This is a great interactive platform for online education.