Final answer:
The left foot should be used for the manual clutch in a vehicle with a manual transmission, while the right foot is dedicated to the brake and gas pedals.
Step-by-step explanation:
When operating a vehicle with a manual transmission, the left foot should always be used for the manual clutch. The right foot is then used to operate the brake and the gas pedals. Using the left foot for the clutch is standardized practice to allow for seamless gear transitions and to prevent confusion and potential accidents. It's important for drivers to become comfortable with using their left foot for the clutch, as coordination between the clutch and the gas pedal is crucial for smooth driving and preventing stalling of the vehicle.