I have been doing youth work for a long time on both, local and international level, and I often meet youth workers who have a lot of talent and a lot of energy, but do not have basic knowledge about youth work, much less about the learning process within youth work. In 2019, I was a participant / student of the year-round Training of Trainers program, organized every year by SALTO Youth, where I devoted much of my time to this very topic: non-formal learning in youth work. Together with my colleague Emil Wingren from Finland, we have already developed the idea, goals, and methodology for training within this program, which we named the Key to Non-Formal Learning. For our training, we set the following goals, which I summarize from the application form: (1) Get to know your own learning process. (2) Develop a better understanding of non-formal learning. (3) To get to know the meaning of reflection and to experience different methods of reflection. (4) To better understand the key competences of lifelong learning. (5) Experience different methods of non-formal learning and ways to implement them in their work. (6) Gain motivation for non-formal learning and inspire and motivate others.