Here are some of the key features that are important to have in a food delivery app:

Easy order placement and tracking: Allow customers to easily browse menus, customize orders, and track the status of their delivery in real-time.

Payment integration: seamlessly integrate secure payment gateways like Stripe or PayPal into the checkout flow. Offer multiple payment options.

Location services: Use GPS to identify the customer's location for proximity-based restaurant suggestions. Provide accurate delivery ETAs based on locations.

Push notifications: Send important alerts to customers about order confirmations, driver assigned, order picked up and delivered, etc.

Ratings and reviews: Allow customers to rate and review restaurants and drivers. This drives quality and satisfaction.

Promotions and deals: Offer coupons, discounts, and promotional offers to engage customers. Integrate loyalty programs.

Analytics and reporting: gain insights into key metrics like most popular dishes, busiest days, repeat customers, etc. to inform business decisions.

Driver app: Provide an app for drivers to manage assigned deliveries, directions, and customer information.

Customer support: Set up self-help options and live chat/call support to handle customer issues promptly.

I hope this gives you a good overview of must-have features in a food delivery app! Let me know if you need any clarification or have additional questions.