Axel Mammitzsch has been active in IT support for computer users for over 15 years. For him, explaining complicated things in simple terms is part of his daily work.
In his books and video courses he does not explain boring theory from experts for experts, but explains everything practice-oriented for beginners understandably and comprehensibly.
This kind of teaching leads to quick successes and "Aha" experiences for his course participants. In addition the fun factor in his books and video courses are also very important.
I missed some practices it is too theorical