We should follow these three basic principles and don't ask too many questions at once. Please ask only one or two questions at a time, which is more likely to get valuable answers than asking a series of questions at a time. The question should be specific. Don't ask one or two unclear questions, which generally include in-depth questions within the scope of school research. To know that time is precious, those problems that seem hard to say clearly may be directly ignored by them. Don't ask questions beyond the authority of the school. Such as scholarships, grants, enrollment methods, housing and so on. , it is almost impossible to ask.
You can't predict how the school will treat mail. Some schools may be willing to accept emails, but don't send them emails aimlessly unless you have more questions about the research field of the school. Schools generally don't like students with poor autonomy who need constant guidance, and they should avoid appearing too indecisive. If you decide to talk about some more questions about the field of school research, please remember the principle of brevity mentioned above, and a simple email is easier to get a reply.