<ul><li>Khan Academy offers free courses for K-12 students and general learning, with video lessons and progress tracking.</li><li>Coursera provides university-level courses, certificates (paid), and interactive assignments for higher education and career advancement.</li><li>edX offers a wide range of university-level courses from Harvard, MIT, and others, with some paid certifications, suitable for professional development and college-level learning.</li><li>Udemy's Free Courses section offers video lectures, self-paced learning, and lifetime access, making it ideal for skill-based learning.</li></ul>

There are several free online education platforms offering high-quality courses across various…

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