What do stage lighting and sound technology do?

I suggest you don't go to the teacher. To put it bluntly, the apprentice is working. Moving and lifting, you should know that the performance is very tiring, building a stage, hanging lights and throwing lines. Wait a minute. These things are done by apprentices and laborers. Then you have learned very little. I have been an audio engineer in the audio industry for six years, and some things are still relatively clear. Playing with sound is definitely not as simple as some people say.

For your next question, the master level depends on the size of his performing arts company. The number of large performing arts companies that Beijing can cooperate with CCTV can reach more than seven or eight thousand, and the remaining small-scale companies will cost two or three thousand yuan. So I don't recommend you to do this. If you really like stereo, take it as your hobby. Unless you are your own boss.