Online disinformation poses a significant threat to society and democracy. Building resilience to disinformation among young people is an essential element in digital citizenship education. This course explains what disinformation is and how to address it with learners. It identifies the skills and attitudes needed to evaluate the credibility of online information, and ways in which young people can be helped to develop these.The course is suitable for teachers and educators of all age-groups and takes 10 to 20 hours.