I think that being able to explain difficult and complex content concisely is a skill. From this perspective, this lecture is truly the best lecture. I can feel the inner strength of the person who created the lecture. I think that not only non-majors but also majors will be able to understand much more easily and deeply if they take this class once before learning about operating systems. I had a lot of questions about operating systems, but it was greatly resolved. I highly recommend it.