Some problems about online recruitment of director assistants, artist assistants, props or costume assistants for audience seats. If you know, please tell me.

Many of them are true. Prop costumes are an important part of a crew and are made by professionals. Artist assistant is not that simple. If you want to join the crew, you must have certain experience or professional study, otherwise you can only do field work or even fail to do it. So you can try to do the field work first and see what a complete crew looks like, so that many of your questions can be dispelled, but the field work is very hard.