This is the best teaching I've ever seen. Among the lecturers, there were many who had poor teaching methods compared to their knowledge, so I couldn't understand them well and forgot what I learned even after watching the lectures, but this time I think I'll remember it well. In particular, it's great that you explain in detail which functions are used in which cases and for what purposes. I don't usually leave reviews, but I thought it would be good for many beginners to see it, so I took the courage to write it. I'm looking forward to the Docker lecture as well.