Training needs to distinguish between volunteer categories, and it is hard to say if you are not sure about the category.

For example, volunteers for major festivals need to be trained in etiquette, reception, meetings, translation, explanation, security inspection, etc., as well as the geographical survey, industrial development survey and overall activity arrangement of festival venues, as well as volunteer work practices such as hotel reception, tour guide explanation and practical English.

And AIDS prevention volunteers are AIDS prevention knowledge, AIDS prevention development and so on.

Different categories vary greatly.