It is now considered a mark of quality for schools to actively deal with the issue of cyber-bullying, to take preventive measures and to know how to react when the occasion arises. The teaching material "Active against cyber-bullying" is primarily about raising awareness of cyber-bullying - not only among the pupils themselves, but also among their parents and teachers. Understanding where the line between fun and hurt lies, what different roles there are in a cyber-bullying case and how prevention can help is important for this. In addition to the theoretical introductions, this handbook contains appropriate exercises for the classroom, which facilitate the introduction to the topic and the reflection. These are assigned to "Digital Basic Education" at secondary level 1.