I think it's best to talk about something that suits your style. Do ppt if ppt is good, but I personally recommend writing on the blackboard because PPT can't be fully displayed to you. You can carefully design a blackboard, make some pictures, play some bad games and show a vivid lesson in simple and humorous language, that's all.

There is also an interview, which depends not only on the arrangement of your class content, but also on your appearance, typhoon, field control ability and the most important interaction ability for students, so that students can participate in your class.

This is my suggestion, I wish you success!