One mask, one person, it should not be used interchangeably.
Make sure to choose mask which cover face area—above the nose to the bottom of your chin—ideally.
For cloth mask, wash before use.
Wash your hands with soap and water or wipe your hands with alcohol before putting mask on.
Mask should not be used for a long time, maximum 4 hours (quoted from Halodoc). If it already wet or dirty, use the new one.
Not touch mask—change positions or tighten loose ties for headloop masks—make sure to wash your hands or use hand sanitizer first.
If you really need take off mask, take it off thoroughly. Not put on exposed area like your neck or any exposed surfaces.
Remove mask without touching eyes, nose or mouth.
Change with the new one if you find your mask already loosen its ties, rip, and so forth.
Wearing cloth mask will not be effective in preventing transmission of COVID-19 if you cannot keep safe distance from others, not wash your hand or use hand sanitizer as often as possible, not apply coughing and sneezing ethics and skip healthy meals as well as exercise to keep your body healthy.
Here is an infographic related mask that comes down to your chin for additional reference.