To use a steel square for marking and cutting angled finger joints, place the square against the edge of the wood and align it with the desired angle. Use a pencil to mark along the edge of the square, creating a straight line. Repeat this process for all the necessary cuts. Then, carefully cut along the marked lines using a saw, ensuring to maintain the angle indicated by the square. The steel square serves as a guide to ensure accurate marking and cutting of angled finger joints.
