When there were no new concepts like abstract classes or interfaces, I was able to see with my own eyes the inconveniences and write improved codes using those concepts, which made it easier to understand these concepts and why they were necessary and why I had to use them. Overall, rather than teaching various Java concepts individually, I felt like I was listening to an interesting story throughout the lecture because it explained them in a big way. And the lecture materials were well organized, so I plan to look them up often in the future when I get confused or forget a concept. I hope you give me the next lecture soon. Thank you!