(1) Dave from Baidu Library

This is Baidu's website for downloading learning materials for teachers, students and friends during the epidemic. Coursewares from primary school to high school can be downloaded here, completely free.

(2) Beijing Digital School

This is the website of Beijing Sky Classroom. You can watch teaching videos and download corresponding courseware, which is completely free from primary school to high school.

(3) Teaching network

All over the country, all subjects and versions, covering junior high school and senior high school. Many courseware here are arranged in sets. Download an entire volume with one click. According to some new ideas, it can be used directly with a little modification.