Using this Grit Extremist Wild Green BMX bike is easy. Just hop on, hold the soft - feel grips, and start pedaling. Whether you're riding on the street or in the park, the bike can handle it well. When riding, make sure you're wearing proper safety gear like a helmet. As for maintenance, regularly check the brakes to ensure they're working properly. You can use a clean cloth to wipe down the bike after each ride to keep it clean. Also, check the wheels and tires for any signs of wear and tear. If you notice that the tires are losing air or the wheels are loose, it's time to make some adjustments or replacements. And don't forget to lubricate the moving parts like the chain every once in a while to keep the bike running smoothly.