Tencent classroom really meets the standards of massive courses. If you want to learn something, you can get a lot of courses by typing keywords in the search box, many of which are free.

The advantage lies in the perfect combination with WeChat and QQ, which can realize online interactive learning; The function of the question bank is that it is easy to search questions and there are many real exercises. I suggest you listen to their opinions when you choose.

Second, learning and thinking online school

Xueersi Online School is an educational App under Beijing Xueersi Network Technology Co., Ltd.? [1] The course covers all subjects from primary school to senior high school, such as Chinese, mathematics, English, physics and chemistry, history and geography, as well as excellent courses such as programming, humanities, history, science and art. It adopts the dual-teacher teaching mode, with lecturers giving lectures on the spot and tutors providing exclusive guidance.

Third, there are excellent courses.

There is an excellent course that divides the study of related knowledge points into every subdivision. For example, only junior high school mathematics comprehensive exercises are subdivided into many knowledge points, and each knowledge point has 20 exercises, as well as packages and training camps, but the tuition is a bit expensive, depending on personal circumstances.

The above content refers to

Baidu encyclopedia-Tencent classroom

Baidu encyclopedia-xueersi online schools

Baidu Encyclopedia-Youdao Excellent Course