Duke University offers three courses on our catalogue. The Introductory C Programming course teaches C fundamentals over five months at beginner level. The AI Product Management course runs for four months and suits learners new to product roles. The Explainable AI (XAI) course is a one-month beginner programme. All three provide a certificate and are self-paced in English. Artificial Intelligence C Programming Product Management subject hubs group related courses. Free options are not available; all three courses carry a fee set by Coursera. Certificate completion is included in each course fee. Typical length ranges from one to five months depending on the chosen programme.