Probably 2 and 3 are bigger factors if not getting sick than 1. Although never eating out also reduces your exposure to others that may be sick. Of course avoid

Probably 2 and 3 are bigger factors if not getting sick than 1. Although never eating out also reduces your exposure to others that may be sick. Of course avoiding people who cough and sneeze send a bit paranoid. I don't do any of those things, and precovid the only times I got sick were after a plane trip out standing in a long line for hours.