To develop a car rental app like Turo, start with comprehensive market research to understand user needs and competition. Design intuitive UI/UX for easy navigation and booking. Develop backend systems for user registration, vehicle listing, booking management, and payment processing. Integrate features like GPS tracking, insurance verification, and user reviews. Conduct thorough testing for functionality, security, and scalability. Finally, launch with a robust marketing strategy to attract both car owners and renters to the platform.