Take showers or baths.
Wipe your butt after you poop.
Open your eyes while driving on the freeway.
Not stick your head into a hornet nest.
Not set your house on fire.
Put on a parachute before jumping out of an airplane.
Not drink bleach or shoot horse de-wormer up your rear end.
Have common courtesy.
Be a good person.
Do real research on vaccines, not just find internet groups that support your bias.
Pay attention to the vast majority of scientists and medical experts.