React Props and State are fundamental concepts that serve as the building blocks for constructing dynamic user interfaces in React applications. Props are short for properties, which allow components to receive data from their parent components, enabling the dynamic rendering of content. By passing props, developers can customize and configure components, ensuring that each instance behaves according to the context it is used in. For instance, a Button component can receive text and styling as props, making it versatile and reusable across different parts of the application.

On the other hand, State is a special object that determines a component's behavior and how it renders. Unlike props, state is managed within the component itself and can be modified using the setState function. This is crucial for creating interactive interfaces, as state changes trigger re-renders of the component, reflecting the updated data. For example, a Counter component maintains its count in state, and every time the user clicks, the state is updated, showcasing real-time changes on the interface. Understanding how to effectively use props and state is essential for any React developer looking to create engaging and responsive user experiences.

When it comes to elevating your React applications, incorporating the right libraries can significantly enhance your UI development experience. Here are the top 5 React libraries that every developer should consider:

1. Material-UI: This popular library provides a rich set of components that adhere to Google’s Material Design guidelines, enabling developers to craft stunning UIs with ease.
2. React Router: Essential for implementing navigation, React Router allows you to create dynamic routing in your single-page applications.
3. Redux: For managing your application state, Redux offers a predictable state container that helps in writing applications that behave consistently.
4. Ant Design: This design system provides a set of high-quality components and demos built on React, perfect for enterprise-level applications.
5. Styled-Components: Utilizing CSS-in-JS, Styled-Components allows you to create component-level styles, promoting modularity in your code.

Creating user-friendly components in React is essential for enhancing the overall user experience. To start, focus on component reusability and modular design. This means designing components that can be easily adapted for various scenarios without needing significant changes. You can achieve this by breaking down your UI into smaller, self-contained components, which helps maintain clarity and manageability. Additionally, utilize prop types to ensure that the right data is passed to components, facilitating easier debugging and improving the usability of your code.

Another tip for building user-friendly components is to prioritize accessibility. Ensure that your components are easy to navigate not only with a mouse but also via keyboard. Incorporate ARIA attributes to improve the accessibility of your components and allow screen readers to interpret them correctly. Finally, consider implementing responsive design principles, ensuring that your components display well across various devices and screen sizes. By focusing on these areas, you can create components that provide a seamless and intuitive user experience.