Using this coffee bean grinder is easy. First, open the hopper on top and pour in the coffee beans. Then, turn the handle gently to start grinding. You can adjust the fineness of the grind by turning the adjustment knob. As for maintenance, make sure to clean it regularly. After each use, use a small brush to remove any leftover coffee grounds. Keep it in a dry place to prevent the metal from rusting. When not in use, store it in a cool and dry environment. Be careful not to over - tighten the handle or adjustment knob to avoid damage.