Using this Deejo knife is easy. To open it, simply hold the handle and use your thumb to slide the blade out until the liner lock clicks into place. When you're done, press the liner lock to release the blade and carefully close it. For safety, always keep your fingers away from the blade when opening or closing. To maintain this knife, wipe it dry after each use to prevent rust, especially if it gets wet. You can use a soft cloth and a little mild soap to clean the blade and handle. Store it in a dry place, and if possible, use the belt clip to keep it secure. Avoid using the knife for tasks it's not designed for, like prying or cutting extremely hard materials, as this could damage the blade.