Two training institutions, such as Zhonggong and Tuhua, are relatively large, so teachers are naturally not allowed to say that they are the best. However, it is more expensive to mainly do offline courses. After all, people provide venues. So it doesn't apply to everyone.
Then online education should talk about chalk and our Tanzhou, which are both big companies, natural and reliable, suitable for a wide range of people and affordable for the whole people. But it's an online course, which needs a little self-control, otherwise it's a bit wasteful.