It can't be described as good or bad. This website can see the interactive classroom of famous teachers from primary school to high school, just like we listen to classes in school classrooms. Its advantage is that you can preview the courses you want to learn and review the courses you didn't learn well in advance with the teachers above. Personally, I think it is still very effective. After all, it is very convenient. The above are mainly interactive videos of famous teachers, which are available from the first grade of primary school to the third grade of high school. Sitting in front of the computer and studying with the teacher above has the same effect as sitting in the classroom. You can preview the courses you want to learn and review the knowledge you have not learned well with the teacher above at any time!