This dossier is divided into two main parts. The first part provides concrete and useful information on cyberstalking, cyberbullying, its functioning and dynamics. This theoretical information supports the understanding of the processes involved in cyberstalking and enables targeted intervention. In this way, you can act proactively and avoid the uncontrollable snowball effect of cyberbullying. The second part of the dossier is about activities you can carry out with young people around the topic of cyberbullying. These methodologies are divided according to the different levels of prevention and can thus be carried out in a targeted way according to the needs of your group. They do not have to be carried out in chronological order.