Using this DeWalt 5 - tool combo kit is a breeze. For the drill/driver, simply select the appropriate speed for your task. The low speed (0 - 450 rpm) is great for heavier drilling or driving larger screws, while the high speed (1,500 rpm) is ideal for lighter tasks. When using the reciprocating saw, make sure to secure your workpiece well. The keyless blade clamp makes it easy to change blades when needed. For the circular saw, adjust the cutting depth and angle according to your requirements. The carbide blade ensures smooth and efficient cuts. The oscillating multi - tool can be used for various tasks like sanding, cutting, and scraping. Just attach the right accessory. The impact driver is handy for driving screws quickly. The 3 LEDs provide extra light when working in dark areas. As for maintenance, keep the tools clean after each use. Wipe them down with a dry cloth. Charge the batteries only with the provided charger and store them in a cool, dry place. If you notice any issues with the tools, stop using them immediately and contact DeWalt's customer service.