The first is the website of the national public service platform for educational resources, with the website/. This platform mainly provides courseware ppt, which is a very useful platform for teachers. In particular, you need to find resource packages, teaching courseware materials and interpretation of curriculum standards for primary schools, junior high schools and senior high schools. You must not miss this platform.

The second is the university resource network, which covers everything from junior high school to university. They are all video teaching, and they are all taught by famous teachers.

The third is the national online platform for primary and secondary school experiments. The website is/,which is mainly aimed at physics, chemistry and biology experiments of junior middle school students.