While vocational training in the 20th century was purely analogue, in the 21st century the worldwide spread of the internet has opened up numerous new possibilities. In addition to traditional classroom training, methods such as virtual classrooms, digital self-learning, and also blended learning, a combination of classroom training and digital learning are available. In particular, the question of sustainabilityplays a decisive role in the selection of the training format. A training course is particularly sustainable when it considers the three pillars of learning – willingness, knowledge, and ability. Sustainable training enables learners to put the acquired knowledge into practice.