What advice does the author of How do you Jump start a car battery give for connecting the jumper cables to the battery?

The author advises connecting the jumper cables in a specific order to ensure safety and effectiveness. First, attach one red clamp to the positive terminal of the dead battery, then the other red clamp to the positive terminal of the working battery. Next, connect one black clamp to the negative terminal of the working battery and finally attach the other black clamp to an unpainted metal surface on the dead vehicle. This method helps prevent sparks and potential damage to the vehicles.