I already knew Java, so I took the course to review and fill in the gap of a year, and even though it was almost all the content I already knew, the instructor's detailed explanations were very impressive. In particular, the lecture method of asking the question "Why?" for whatever you learn and helping you understand the fundamentals was very helpful. Also, I was touched by the instructor's teaching philosophy and life stories in the middle of the lecture, and I felt that it was a deep lecture that went beyond simple technical education. I really recommend it!