Learn from here.More people are willing to pay high prices to buy expensive watches, which also indicates that the maintenance of watches is also quite expensive.But you can look here know about watches basic knowledge.

Suggestions on maintenance and repair In order to guarantee the proper operation and accuracy of your watch, we recommend regular maintenance.

Test water resistance and wash the watch once a year.
Carry out overall maintenance once every 5 to 7 years if your watch is a quartz watch.
Carry out overall maintenance once every 3 to 5 years if your watch is a mechanical watch.

With such maintenance, you will always keep your watch in a sound working condition and effectively prolong its working life. But it is only applicable for watches in normal working conditions with the exception of improper wearing or continual impacts. Suggestions:

Wind up the watch at the same time every day if possible if it has a manually-wound movement in it and this helps to sufficiently empower the watch for the next 24 working hours.
It is not necessary to manually wind a watch with an automatically-wound movement in it under normal circumstances because the power comes from arm movements of the wearer. Manual winding may be necessary if the wearer has limited movements. But remember to control the crown adjustment within 20 cycles during winding.
Please turn the crown for 20 cycles if an automatic mechanical watch has been off your wrist for more than 40 hours. This can restart the driving system of the watch movement.
Replace the battery of your quartz watch once every two years to preclude any sudden stopping of the watch movement.
Please make sure that the crown is always locked in order to avoid moisture ingression into the case and sustain the water resistance of the watch.