Infinite scrolling is a technique that enhances user experience by dynamically loading content as users scroll down a page, eliminating the need for traditional pagination. The guide explores three different ways to implement infinite scrolling in React applications: building a custom solution from scratch, using prebuilt libraries like react-infinite-scroll-component and react-window-infinite-loader, and leveraging the Intersection Observer API. Each method has its pros and cons, with the custom approach offering full control and customization, while libraries provide quick and reliable solutions with built-in optimizations. The Intersection Observer API offers a modern, efficient solution but may require polyfills for older browsers. The guide also discusses implementing a "scroll to top" feature to further enhance user experience, using the scrollTop property and useRef hook in React. The choice of method depends on specific requirements, such as the need for customization, the desire to minimize dependencies, and browser compatibility considerations.