This goes without saying. Always keep your mask on and make sure they’re worn properly.
The mask primarily serves as a cover for both your nose and mouth that reduces the transmission of bacteria and viruses. It greatly helps when you’re trying to reduce contact with other people, in crowded places like malls or the supermarket.
If given the option, try to get the conventional surgical mask. It is better recommended, as it is tailor-made, with the proper material, for situation like these.