To ride a hardtail mountain bike, start with a proper tire pressure and saddle height. Shift to an appropriate gear and approach obstacles with a balanced posture and relaxed grip. Keep your eyes focused on the trail ahead of you, and use your body weight to steer the bike and absorb impacts. When climbing, maintain a steady cadence and use your legs to power up and over any obstacles. Always wear proper safety gear, including a helmet, and practice regularly to improve your skills and confidence.

To jump on a mountain bike as a beginner, start by finding a small ramp or obstacle to practice on. Approach the obstacle with moderate speed and as you reach the top of the ramp, push down on the pedals and lift the front wheel off the ground by pulling back on the handlebars. As the rear wheel reaches the top of the ramp, push off with your feet and hop into the air. Keep your weight centered over the bike while in the air and use your knees to absorb the landing when you come back down. Practice makes perfect, so keep trying until you feel comfortable and confident with your jumps.

To install a mud guard on a mountain bike, first, select the appropriate type and size of the mudguard to fit your bike. Next, locate the mounting points on the frame and fork where the mud guard will attach. Attach the mud guard with bolts, screws, or zip ties, making sure it is secure. Adjust the position of the mud guard so that it provides maximum coverage while still allowing for proper clearance of the wheels, tires, and brakes. Finally, test ride the bike to ensure that the mud guard is not rubbing against the wheels or causing any other interference.