It depends on what you do. If you are an instructor, you must be good at English and can sing. At least, don't go out of tune, because there are many songs to sing in class. And a little affinity. There are no other requirements.

If you are a consultant, there are no special requirements. Of course, people with similar experience or sales experience will definitely have an advantage.

There is no need for research, but if you have a nanny's card or a teacher's card, you will definitely get extra points in the interview.