With the advancing digitization in medicine, digital medical data is playing an increasingly important role in health care and research, which is why data literacy must already be taught in medical education. To this end, a 28-hour online elective for medical students - following a constructivist approach – has been implemented. It teaches learners different aspects of data literacy for a critical collection and use of sensitive medical data. The assessment of the learners’ reflections on the course topics shows, on the one hand, the importance of data literacy from learners’ perspective and, on the other hand, the importance of taking an overarching and coherent view of medical data. In further curricular courses, such as medical ethics, and statistics, special themes are to be deepened in an application-oriented manner.