Using the Milwaukee 2680 - 20 is straightforward. First, make sure the battery is fully charged. Insert the battery into the tool until it clicks into place. For cutting or grinding, select the appropriate guard (Type 1 or Type 27) and adjust it using the tool - free mechanism. Hold the tool firmly with the side handle and the main grip. Press the paddle switch to start the tool. When using, keep the tool moving steadily over the material. As for safety, always wear safety goggles and gloves. Don't use the tool in wet conditions. Avoid overloading the tool to prevent damage. To maintain the tool, clean it after each use. Use a brush to remove debris from the vents and the body. Check the guards regularly for any signs of wear or damage. If the tool is not going to be used for a long time, store the battery separately and in a cool, dry place.