Boost your career with Harvard’s 6 free online courses in AI, Python, and Web Development! Learn about the 2026 course list, duration, and how to enroll for free at pll.harvard.edu.

Massive open online courses, or MOOCs, usually don't cost a dime, but there are benefits for those who pay to enroll, experts say. Proponents of MOOCs have lauded this form of education for providing ...