List the 3 basic rules for keeping prepared foods safe by controlling temperatures

Temperature is one of main condition that controls the growth of microorganisms. Hence, controlling temperature is one of main thing that affects to the food safety. Here are three rules which should do to keep the food safety by controlling temperature. 

1. Keep the foods at refrigerator which has 40 ° F as maximum temperature while freezer is at 0 ° F

2. All food items which are leftovers or purchased should be kept in refrigerator within 2 hours.

3. Hot foods should never reach low temperatures than 135 °F (60 °C).