I used to study and use Spring 3.x in the early days, but then I changed jobs and my job changed, so I started working on data processing using Python. Recently, my job changed again, so I started working on Spring development, and I started studying Spring again to understand the operating system, and I came across Younghan's lecture. Thank you for explaining the content so easily. I think you are very good at explaining difficult content in an easy-to-understand way. I was able to understand it well because you explained easy content in a friendly language while watching the lecture. I am also taking other lectures! Thank you!