The only guarantee for offline training courses is that the teaching location is fixed, and there is no guarantee on the teachers. In the Internet era, it is recommended that you choose online school training. First of all, the teachers can be guaranteed. There are public free trial classes, and you can follow the teacher you like. Learning will achieve twice the result with half the effort! And there is no time limit. You can study and do questions on your mobile phone or computer. WeChat has one-on-one teaching assistants to answer questions in real time and make study arrangements according to your own situation!