Using your Longines Master Collection watch is a breeze. Just look at the dial to read the hours, minutes, seconds, and date. To keep the watch running, as it's an automatic watch, simply wear it regularly. The movement gets energy from your arm's movement.
When it comes to water resistance, it can handle splashes and short periods in water, but don't wear it for swimming or diving as it's only water - resistant to 3 bar.
For maintenance, keep the watch clean by wiping it gently with a soft, dry cloth. Avoid exposing it to extreme temperatures or strong magnetic fields. If you notice any issues, like the watch losing time or the strap getting loose, it's best to take it to a professional watch repair service. And always store the watch in a cool, dry place when you're not wearing it.