The most important rule is often mentioned - wear a face mask, wash your hands and keep the distance from others. Together with a minimum of social contacts, this rule is simple and very effective prevention against the COVID-19 disease.
Do not go to places with a higher concentration of people unless it is necessary. There are volunteer groups that can bring your groceries right to your home. If you are planning to visit family, choose a walk together instead of staying in a closed room.