Actually, the number one thing would be to use a mask whenever you are out. I suspect breathing in aerosolised virus particles is the main mode of infection now. Second would be not touching your face. Washing hands, as important as it is, comes third.

I laugh inwardly whenever I see stores requiring the use of hand sanitizer at their entrances; they should be handing out masks if they are serious. Of course that's much more expensive than doling out sanitizer.

I expected governments to organize mass production and distribution of re-usable face masks for their populations, but so far I see nothing of the sort. If we are going to be able to resume a somewhat normal life going forward, use of mask has to become the norm rather than the exception.