Low cost knowledge acquisition
Knowledge can be acquired at a lower cost. In the past, you had to take courses at Peking University (for example), but now you can hear them online, and the learning cost has become lower.
Wide coverage of students
Online education has low cost and wide coverage of students.
A leap in the education industry
From the perspective of the whole society, this is undoubtedly a big leap in the education industry. I think this significance is as great as Cai Lun's improvement of papermaking.