I am a teacher and want to offer one-to-one or one-to-many online classes. I don't know how to do it. It is better to have a free platform.

Online one-to-one or one-to-one, you can use the third-party platform of WeChat to build a teaching platform. Small program platform helps you to do enrollment marketing, providing graphic, audio and video, live broadcast and other teaching forms. But at present, there are few free platforms, or they are not very reliable (live tapes and the like). Mainstream platforms generally provide a 7-day use period, so teachers are advised to use them first.