The course validity period is the effective learning time after the course starts, from the beginning of the course to the end of the course.
Each course can view the specific expiration date on the course introduction page.
Coursewares such as live broadcast, recording broadcast and materials of courses within the validity period can be learned repeatedly; If the period of validity expires, all the contents of the course will not be available (including cached videos).
Therefore, please check the validity of the course in detail before purchasing goods, and purchase the course according to your learning progress.