What are 4 guidelines for storing milk?

3. Don't store milk in the refrigerator door. The temperature in the refrigerator door fluctuates more than the temperature in the middle of the refrigerator, so it is best to store milk in the middle.

4. Throw out milk that has sour smell or taste. Milk that has spoiled will have a sour smell and taste. If you are not sure whether milk has spoiled, you can taste a small amount of it. If it tastes sour, throw it out.