This might seem like a simple how-to, but since a power drill is a necessity for any home DIY projects, it's important to fully understand how to use one.
Higher torque is typically used for drilling and lower torque is typically used for driving. TIP: when you're drilling or driving into hardwoods or a harder surface, more torque is required
To open the chuck by hand, hold the chuck with one hand. Place the toggle into reverse, and engage the trigger. The chuck will open. Insert your bit. Hold the chuck again. Adjust the toggle to forward. Engage the trigger until fully tightened.
Use a speed square if needed. There are occasional times your drill won't be perpendicular, like when using Kreg pocket hole screws.
Adjust the speed as necessary, as most triggers have speed control. Additionally, you can adjust the speed on the top of the drill with an additional speed toggle (on most power drill models). Remember: higher speed is for drilling, and a lower speed is for driving.
Once you have reached the desired depth, adjust the forward/reverse setting to reverse. Engage the trigger and remove your bit from the piece.