This guide summarises our longstanding experiences in the field of civic education, prevention, and radicalisation. It draws on various offline and online projects with youths from various religious and ethnic backgrounds and builds upon several years of training and consultancy with teachers, social workers, municipalities, and police officers. The guide informs readers about the growing popularity of Salafist ideology among youths and highlights the various motivations that can lead youngsters to join religious extremist groupsand organisations. With its focus on schools and youth work, it provides concrete examples of how to prevent radicalisation processes and to intervene in religiously motivated conflicts.