Final answer:
The driver should rest their left foot on a stable and comfortable surface, such as the vehicle floor or footrest area, to avoid interfering with the vehicle's operation.
Step-by-step explanation:
When preparing to drive and when driving, the driver should rest their left foot on a surface in the vehicle that provides stability and comfort, such as the floor or footrest area. It is important to avoid placing the left foot on the brake pedal or any other control pedals while driving, to prevent accidentally applying the brakes or interfering with the vehicle's operation.