Tiantuan, a junior high school teacher, is a professional online education institution. Their online video courses are composed of well-known and experienced senior high school teachers who have professional teaching knowledge and experience and can provide high-quality teaching content. The curriculum content of junior high school teachers group has been strictly screened and audited, which meets the relevant regulations and standards of the Ministry of Education. Moreover, junior high school teachers have cooperated with many well-known schools and educational institutions and have a good reputation and credibility. Therefore, the junior high school teacher Tiantuan is a formal online education institution.