Using this knife is a breeze. Just open the blade with your thumb and engage the liner lock to keep it secure. When you're done, disengage the lock and carefully close the blade. For safety, always keep your fingers away from the blade's edge when opening and closing. To maintain your knife, clean it with a dry cloth after each use. If it gets wet, dry it thoroughly to prevent rust. You can also use a little oil on the moving parts to keep them working smoothly. Avoid using the knife for tasks it's not designed for, like prying or cutting extremely hard materials, as this can damage the blade.