You should wash your hands after:

Going to the bathroom
Helping change your younger sister's or brother's diapers
Blowing or wiping your nose with a tissue
Covering your mouth/nose when you cough or sneeze
Preparing food
Touching burns, cuts, or sores
Playing with pets and animals
Handling dirty dishes, utensils, or touching cabinet tops where food is prepared
Being around someone who is sick
Being physically active
Taking out the garbage

You should always wash your hands before:

Handling food
Setting the table
Eating
Treating a scrape, cut, or wound
Tending to someone who is sick
Putting in or taking out contact lenses

Wash your hands more often when a family member or friend you spend a lot of time around is sick. This will cut down on your chances of catching whatever nasty germ they have.