Courseware website for free study: 1, Bi Li Bi Li is not only an entertainment platform, but also a large number of high-quality online course resources. It is even affectionately called the second classroom of the university by college students.

2. There are free materials on the website of Exam Bao, such as the question bank of university research, postgraduate entrance examination and other free materials.

3. Massive open online courses for college students are the online learning platform for national excellent courses. There are thousands of excellent courses in famous schools.

4. School Online: School Online is an online course platform initiated and established by Tsinghua University. It not only brings together a lot of basic course resources, but also various practical skills courses, such as C language programming.

5.exd: It is an online course platform jointly built by MIT and Harvard University, including courses of Qingbei and many world famous schools.