Learn to design a responsive social media application using React, HTML, and CSS in this comprehensive tutorial video. Master the implementation of dark and light modes, React Hooks, Context API, and responsive design techniques. Follow along as the instructor guides you through creating login and registration pages, setting up React Router Dom with protected routes, and designing various UI components including the navbar, left and right menus, user stories, posts, comments, and profile pages. Gain insights into CSS sticky positioning, implementing dark mode with React and Sass, and utilizing the Context API. Conclude with a deep dive into responsive design using React Sass and CSS media queries, equipping you with the skills to build modern, user-friendly social media interfaces.