Using your Deejo knife is straightforward. Just press the liner lock to open or close the blade. When using, always make sure to cut away from your body to avoid accidents. This knife is great for various tasks like opening packages or preparing food. As for maintenance, clean the blade with a dry cloth after each use. Avoid leaving it in wet or humid conditions for long periods as it might cause rust. You can also use a little bit of oil on the blade and moving parts to keep it working smoothly. Don't use it for heavy - duty jobs that it's not designed for, as it could damage the blade or the handle. With proper care, your Deejo knife will serve you well for a long time.