During the development of the custom eCommerce store, one of the main challenges was designing a relational database structure that could efficiently manage products, categories, users, and coupons without creating data redundancy. Implementing a secure authentication system required proper password hashing, session handling, and protection against SQL injection and unauthorized access. Building a fully functional admin dashboard from scratch demanded careful CRUD logic implementation and role-based access control. Another challenge was creating a reliable coupon validation system that dynamically adjusted pricing while preventing misuse. Ensuring smooth data flow between frontend and backend while maintaining performance and scalability required structured query optimization and clean separation of concerns.