It is not just about wearing the mask always when outdoors. Equally important is to wear it properly and take the necessary steps in using and discarding it.
From what I have read and understood-
1. Never touch the front of the mask. Most people are doing this on a regular basis. You should not constantly touch it and adjust it. I agree it is a bit annoying to have it against your face and you tend to fidget with it as you do with your spectacles. If you do need to adjust it, then hold it at the edges. You see, you are likely to be touching various surfaces and then putting your hands on the mask, which is not a safe thing to do. Some people use it like a rubber band, pulling it forward, then releasing it. Ridiculous.
2. The point of the mask is to cover both, the nose and the mouth, not just the mouth.
3. Don't let the mask hang around your chin or your neck. Just think - the sweat from the skin goes on it and you are going to put that back on your nose and mouth.
4. The mask should not be loose. Buy one that fits securely and is unlikely to slip down or leave gaps. At the same time, it should be comfortable enough to be able to breathe.
5. Do not remove the mask to have a conversation with the shopkeeper, somebody else you meet or when answering the phone.
6. Always wash the mask right away on returning home, with a little warm water and hang to dry, away from other things. This is if it is safe to reuse. If very dirty, discard and take a fresh one. If you have sneezed or coughed in it, wash and discard.
7. Discarding the mask - cut it up and wrap in a piece of paper, then discard. When cut, it cannot be picked up from garbage dumps to be washed and resold.
8. Do not share the mask with anyone, not even family members and even if washed. Each family member should have their own set of masks.
[Note for Narendran - what Neeru stated is true, that this topic about the necessity to wear a mask in public has been raised earlier, but since you are returning after a long gap, we will allow this discussion for now. Henceforth, please use the search box and if a topic has been taken up and discussed, then avoid raising it again. In case you wish to bring it up with some fresh angle to it, give a link to the earlier discussion thread.]
When you make a commitment, you create hope. When you keep a commitment you create trust! ~ John C. Maxwell