Keep your watch clean, away from chemicals and water, and avoid magnets. You should also service your watch every four to six years.
If the watch's accuracy or power reserve suffers, it may need maintenance.
A day/date watch displays the day of the week and the calendar date, but needs to be reset each month.A perpetual calendar watch takes leap years into account and can display an accurate date for many years.
The size of the watch that looks proportional on your wrist depends on the watch's size and the width of your wrist.For example, a watch that is 36 mm will look proportional on a wrist that is 6 in or less.
The official rule is to wear a watch on your non-dominant hand, but it's ultimately a matter of personal preference.
The watch industry prefers the term "water resistant" over "waterproof" because "waterproof" implies a level of warranty that watches cannot obtain.