Learning and thinking about online courses. The online course "Learning and Thinking" is aimed at all subjects in junior and senior high schools, featuring live calligraphy classes after class and exclusive teaching AIDS. The online course of learning and thinking is mainly promoted by Liu Yachao, the executive principal of learning and thinking, and many teachers with rich teaching experience. BBK tutor is an auxiliary learning tool specially designed for junior and senior high school students, and the online course of learning and thinking is better than that.