From April to June 2021 a lecture series was organized by Technische Universität Kaiserslautern (TUK) in the framework of the Erasmus+ project HI-SMART. Lecturers from the Slovak University of Technology in Bratislava (STUBA) and the Budapest University of Technology and Economics (BME) as well as from Energiaklub in Budapest, presented new and innovative developments in the realm of nealy zero energy building. Students from TUK, STUBA and BME attended the online lectures and contributed to the improvement of content and format by giving direct feedback to the lecturers. The lecture series was held as a „Train the trainer“-session within the ERASMUS+ project with all participating project partners participating and engaging in the discussion.