1. Public required course. For example, college Chinese, philosophy, college English, advanced mathematics and college physical education. Generally these classes are held in a big classroom. Or, different classrooms. Teachers give remote video lessons to college students (usually freshmen) in all classrooms, or teachers give lessons to everyone with ready-made videos. There are also small classrooms for live classes, and there is no video. So, you often see. University public required courses, people from different departments come to class together.

2. Public elective courses. I remember when I was in college, I took public elective courses in official website. There are certain places in the same class. You can't choose when the quota is full. I chose chemistry in my life, because I was interested in Japanese history, and I also chose Japanese Warring States history. I also took some other courses. People from different departments also attend classes together. Teachers have all kinds of classes. Usually watch videos and explain ppt.

3. Specialized compulsory courses. Take classes with people from different majors in the same department. Usually a small classroom. The teacher attended the class on the spot. It also involves some operations. However, public courses, whether compulsory or optional. The teacher can drain water. Failing an open class usually offends the teacher. In specialized courses, teachers rarely release water. And specialized courses are more difficult. The performance is that the knowledge points increase and the difficulty increases. From here on, there will be more and more people who generally fail the exam. Or someone started to fail.

4. Specialized elective courses. People from the same department and major attend classes. Don't take the word elective, just because you don't have to learn it. Be sure to learn, and learn well. Specialized elective courses are the most difficult courses in universities. That's a failing grade. The teacher seldom releases water.

But ... honestly. Whether it is a public course or a professional course. In fact, you are really engaged in this business and rarely use it. It can only be said that open classes can make you feel completely immersed in the academic environment and atmosphere of the university. Specialized courses can give you a professional knowledge background and let you get a little professional edification. If you want to use it, you can only use 1% of the college public courses! For specialized courses, it is 5% to 10%.

Besides, I think any class in college is the best. At least give this teacher a good impression. After all, even specialized courses are not used much. Since it is of little use, it makes no difference.