HARVARD EDX
Introduction to Probability
Probability as the language for reasoning about data, randomness, and uncertainty, taught by Harvard on edX from foundational counting rules up through the common distributions and their real applications. Video lectures pair with problem sets and quizzes, and every lecture and assignment is free to audit; only the optional verified certificate costs extra. The course targets learners who want a rigorous grounding in probability before moving into statistics, data science, or machine learning, where distributions and expectation show up constantly. Completing it gives you the probability vocabulary and calculation skills needed to reason correctly about uncertain outcomes in later applied coursework.