You can watch many high school math online courses on the video. Many teachers are a well-known math teacher, specializing in high school math teaching. You can search for "Yidu" on the website to find relevant video resources. These videos cover all the knowledge points of high school mathematics, with easy-to-understand explanation style and rich dry goods. In addition, Yidu teachers will also give live webcasts in the live broadcast room. Open the app on your mobile phone, log in to your account, search for "Yidu teacher live online class" in the search bar, and then click the live room in the search results to register.