The 3rd edition of the Training School take place in Wiesbaden, Germany in September 18-21, 2023 hosting 24 participants from 14 countries (Moldova, Serbia, Austria, Malta, Germany, Iceland, Estonia, Italy, Portugal, Spain, Bulgaria, Turkey, Poland, Azerbaiyan) as an outcome of our collaboration within cost action ERNST #CA19113 (https://cost-ernst.eu/). This enriching event is tailored for healthcare professionals and students, providing a unique opportunity to learn from top trainers from across Europe. Prof. Reinhard Strametz (Wiesbaden, Germany) introduce participant to the second victim phenomenon and prof. Jose Joaquin Mira (FISABIO Alicante, Spain) present various approaches to support second victims. Participants could discuss with frontliners providing support to second victims like Eva Potura from Austria (https://www.secondvictim.at/), Stephan Bushuven (NOTIS e.V.) and Susanne Heininger (PSU-Akut e. V., https://www.psu-akut.de/#about) from Germany.  Thanks to Sofia Guerra Paiva (NOVA, Lisabon Portugal) training manual is available online (https://trainingmanual.cost-ernst.eu/) and thanks to Joana Raquel Chaves Fernandes anybody could pass a training online (https://course.cost-ernst.eu/). Our team participated on preparation of these trainings and serve as trainers.