In lectures, exercises and practical courses, the focus is not only on imparting knowledge with the help of blackboards, slides and presentations, but also on continuously obtaining feedback from the students, which the teacher can use to assess the extent to which the audience has understood what was said. This is possible without restrictions in the seminar room. In large lectures, in most cases only the first rows can be included for such feedback. In three semesters of teaching via various digital channels, it had to be abruptly accepted that feedback on courses is not given directly and mostly only with evaluations at the end of the semester by the students. The transfer of proven learning concepts to a teaching mode without face-to-face teaching under the unfavourable temporal as well as technical boundary conditions required enormous efforts, but also proved to be an effective driving force to see the way of teaching and the needs of the students from a different perspective.