Which is NOT one of the four basic skills required for operating a commercial vehicle?

First-aid certification is not considered one of the four basic skills required for operating a commercial vehicle. The essential skills for safe and efficient operation typically include vehicle inspection skills, which ensure that the vehicle is in good working condition before and during use; defensive driving techniques, which help drivers anticipate and avoid potential hazards on the road; and map reading skills, which assist drivers in navigating routes effectively.

While first-aid knowledge may indeed be advantageous in certain situations and can enhance a driver's overall preparedness, it is not a fundamental skill directly related to the operation of a commercial vehicle. Therefore, it falls outside the core competencies required for safe driving and vehicle management.