Using your G-Shock watch is easy. Just press the buttons on the side to set the time, date, and other functions. You can also use it to track your activities. Remember, this watch is water-resistant up to 200 meters, so it's great for swimming and other water sports, but don't open the case underwater. When it comes to maintenance, keep it clean by wiping it with a soft cloth regularly. If the battery runs out after about 3 years, take it to a professional to replace it. Also, avoid hitting it against hard objects to keep its shock-resistant feature intact.