This handbook is part of Colourful Childhoods, a project designed to empower LGBTIQ children in vulnerable situations to combat violence across Europe. The information contained here is informed by fieldwork carried out in a number of European Union countries (Bulgaria, Italy, Lithuania, Hungary, Portugal and Spain) during 2022 and 2023 as part of the Colourful Childhoods project. The fieldwork included a transnational survey with the participation of over 3,000 teenagers, eight focus groups with children and teenagers and 83 interviews with professionals who work with children and teenagers. Therefore, this handbook uses data and testimony from project participants throughout the text. The expertise of the project partners was applied to transform the information gathered during the fieldwork into key ideas and recommendations.