If you can't finish learning in three weeks, you can continue to learn. Don't cancel before you finish studying, or you will miss the finished course.

Large-scale open online courses, that is, large-scale open online courses (massive? Open? Online? Courses). In 20 12, top universities in the United States built online learning platforms to provide free courses online. The rise of Coursera, Udacity and edX provided more students with the possibility of systematic learning. 20 13 February, the National University of Singapore cooperated with Coursera Company of the United States to join a large-scale open online course platform. 20 14 In May, China Ministry of Education and Netease jointly launched a large-scale open online course platform of China University with independent intellectual property rights in China.