The reason why the teacher's online course is longer than Shanxiang is because the online course is aimed at teachers in Shandong Province. According to relevant public information, Shandong Province is a big province for teachers to prepare exams. More than 300,000 candidates take the teacher qualification examination every year, and the competition is extremely fierce. For this reason, the super grid course has specially produced detailed courses to help the exams in Shandong Province. Shanxiang is aimed at teachers all over the country, which is relatively not very detailed.