Is the online course of IT training institutions reliable?

Who do you compare the online courses of IT training institutions with? If you want to compare them with offline full-time face-to-face teaching, it is not very reliable. After all, almost all online courses are only broadcast for two hours every day or taught once every other day, less than 10 hours a week. If you study fishing for three days and drying the net for two days, the effect will naturally be greatly reduced.