Perceivably the most significant advantage of the use of state-of-art technology in education is the flexibility in time, places, etc. For instance, the corona pandemic spreading in 2020 taught us how essential this flexibility is. Moreover, online learning facility enables pupils living in far distances, especially from different countries to enroll and successfully finish useful courses offered by numerous institutes. Another area of flexibility is, of course, the interactive tools like "Moodles", which can be used by the lecturers can use them to deliver their courses to large numbers of students.