Although many of them are good, the good ones are good, and the bad ones are 100% victims. ...
Therefore, we must choose a good class, and don't be a victim and be smashed by a bad class!
Good and bad people on the Internet say they are good, but you can't pretend that your teaching level is good. You can have a look and then go to the field.
I searched java on the internet, the first java learning video, the java video of Teacher Du, which is a widely recognized course. You can look for it and go to the field.