You can get the chalk teacher qualification certificate once. The online course app is a software specially designed for users who have obtained the teacher qualification certificate or other teacher qualification certificates. In the case of a large number of live online courses by famous teachers, there is always one for you. You can interact with teachers and classmates to improve your level. You can also watch the playback after class to consolidate your study. Chalk APP is an educational product of Beijing Chalk Blue Sky Technology Co., Ltd. and a vocational training platform to promote scientific and technological innovation. Its software can only get a chance to attend class once, and the second time it becomes a fee, which is trusted and used by the majority of users. This is a very good software.