To use sunscreen effectively, choose a broad-spectrum SPF 30 or higher sunscreen. Apply a generous amount to all exposed skin areas 15 to 30 minutes before going outdoors. Reapply every two hours, or immediately after swimming or sweating. Don't forget areas like ears, neck, feet, and scalp. Sunscreen protects against harmful UV rays, reducing the risk of sunburn, premature aging, and skin cancer. Use sunscreen every day, even on cloudy days, and store it in a cool, dry place. By following these steps, you can ensure proper protection for your skin against sun damage and maintain its health and appearance.