Building an eLearning platform like Coursera involves several key steps. Start by defining your platform's niche, whether it's courses, certifications, or skill development. Choose the right technology stack to ensure scalability and seamless user experience. Focus on building features like video hosting, interactive quizzes, progress tracking, and a secure payment gateway. A clean, easy-to-navigate interface is crucial for engagement. Implement social learning tools, like discussion forums or peer reviews, to encourage interaction. Don’t forget to optimize for mobile and offer responsive support. Lastly, test and iterate based on user feedback to continuously improve your platform’s effectiveness and reach.