Creating a fantasy sports website and app involves several key steps. First, define your target audience and the specific sports you want to focus on. Next, choose a suitable platform and technology stack, considering options like WordPress for websites and frameworks like React Native for mobile apps.

Design an engaging user interface that prioritizes usability, incorporating elements like player stats, team management features, and live scoring. Implement secure user registration and payment gateways for seamless transactions.

Develop core functionalities, such as drafting players, managing rosters, and scoring systems. Incorporate social features to enhance user engagement, allowing players to create leagues and compete with friends.

Finally, ensure your site and app are mobile-responsive and optimized for various devices. Test thoroughly to fix bugs and enhance performance before launching. Regular updates and community engagement will keep users returning, making your fantasy sports platform a success!