Using the Marlin 7 Gen 3 is easy. Just hop on and start riding. On the trails, use the SRAM 12 - speed SX Eagle drivetrain to adjust your speed according to the terrain. When going uphill, shift to a lower gear for easier pedaling, and when going downhill, use a higher gear for more speed. The RockShox suspension fork will automatically absorb shocks from rocks and bumps. As for maintenance, regularly check the tire pressure. Keep the chain clean and lubricated to ensure smooth gear shifts. After a muddy ride, wash the bike gently with water and dry it thoroughly. Also, make sure to tighten all the bolts periodically to keep the bike safe and in good condition.