When using aluminum foil for cooking, it's important to avoid direct contact with acidic or alkaline foods as this can cause the foil to corrode and potentially release aluminum into the food. Also, refrain from using foil with non-stick cookware as it can damage the non-stick surface. Ensure that the foil is not wrapped too tightly around food, especially when cooking in the oven, to prevent uneven cooking. Avoid using foil with sharp edges or corners that could tear. Lastly, do not use aluminum foil in the microwave for long periods or with high power as it can cause sparks or fires. Always follow the manufacturer's guidelines for safe use.