Hello, Tencent's classes are similar in nature to those of Baidu. Half a catty equals 820. Most of their courses are teaching videos and live broadcasts of vocational education. They gave me the impression that they were outside vocational training courses, but Baidu's classes were broadcast live less, while Tencent's classes were broadcast live more. Netease open class is mostly humanities and literature, of course, including professional knowledge, which is more comprehensive than the other two. It feels more like being in a university classroom, and many Netease open classes are free. You can find some courses you want, but Tencent and Baidu are mostly fee-based courses. If you want to see vocational education, I recommend that you use Baidu teaching or Tencent teaching. If you want to pursue humanities and arts, you can use Netease open class.