To design a user-friendly interface, it's important to:

Understand the user: Conduct user research to understand their needs, goals, and behavior.

Create a clear and simple layout: Use visual hierarchy and whitespace to make it easy for users to find what they're looking for.

Use familiar patterns: Use common UI patterns and design elements to make the interface feel familiar and intuitive.

Use consistent design: Keep the design consistent throughout the interface to create a cohesive and familiar experience.

Provide feedback: Provide clear and immediate feedback when users interact with the interface.

Test and iterate: Test the interface with real users and iterate based on their feedback to improve the user experience.