Using the PD - M324 pedals is a breeze. When you're just going for a short trip or don't want to wear cycling shoes, use the platform side with your normal shoes. For more serious rides or when you want better power transfer, switch to the SPD cleat - compatible side with your clip - in cycling shoes. When using the clip - in side, make sure your cycling shoes are properly attached to the cleats. As for maintenance, clean the pedals regularly with a soft brush and mild soap to remove dirt and grime. Check the cleats and pedals for any signs of wear and tear, and replace them if needed. Also, keep the moving parts lubricated to ensure smooth operation. Avoid using these pedals in extremely harsh conditions like deep mud or corrosive environments to prolong their lifespan.