First, let's see what kind of watch you have. If it is a quartz watch, the general problem is that the watch is not accurate. Try degaussing. If the watch stops, the battery is probably dead. Just change the battery. If it is a mechanical watch, there will be many problems, such as time adjustment, insufficient winding, inaccurate walking or stealing stop, slow walking and so on. The internal problems of the movement need to be detected on the meter, and the problems can be solved if they are found out.
If it is an appearance problem, it is relatively simple, such as replacing a broken watch mirror, polishing and renovating the shell or repairing the buckle of the strap.