How do you cut a mortise and tenon joint accurately and efficiently?

To cut a mortise and tenon joint accurately and efficiently, start by marking the locations of the joint on both pieces of wood. Use a chisel and mallet to carefully remove the waste wood for the mortise, making sure to stay within the marked lines. For the tenon, use a saw to cut the cheeks and shoulders to the correct dimensions. Test fit the joint periodically to ensure a snug fit, making any necessary adjustments along the way.