Ideally, you should use a car that the learner will have access to after passing their test. This familiarity will be beneficial in the long run. However, if this isn't possible, look for a car that's easy to handle and has good visibility. Many instructors prefer cars with automatic transmission for beginners, as it allows them to focus on road awareness without the added complexity of gear changes. Some also find that smaller cars are easier for new drivers to maneuver. Regardless of the car you choose, ensure it's in good condition with functioning safety features.