Using the Bosch PS11N 12V Max 3/8 Inch Angle Drill is straightforward. First, make sure you have a compatible battery and charger as they're sold separately. Insert the battery into the drill. Next, choose the right drill bit for your job and use the 3/8 Inch auto - lock chuck to secure it. You can adjust the drill head to one of the five positions by rotating it 90 degrees and locking it in place. Use the variable - speed trigger to control the drilling speed according to your needs. When drilling in dark areas, the two LED lights that rotate with the chuck will help you see clearly. Remember to wear safety goggles and gloves to protect yourself. After use, clean the drill with a dry cloth to remove dust and debris. Store it in a dry place to prevent rusting. Periodically check the chuck for tightness and the battery for proper charging. With proper care, your Bosch drill will serve you well for a long time.