#4 Keep Your Hands To Yourself
It sounds easy but it’s actually really hard. There are things that we can’t avoid touching, like doorknobs and money. You won’t know anything about who touched it, making it very dangerous to your security.
As much as possible, keep your hands to yourself and only touch public things when necessary. Even then, it’s always best to wash your hands or sanitize right after, before you touch your face or your stuff.