While listening to the teacher's lecture, rather than just following along, I am studying by listening to everything and looking at the lecture materials, making my own projects, and reviewing the operating principles. While doing so, I am trying to make it myself by watching the videos for parts that I do not know. I am studying by making the settings part in XML and in Java like the teacher, and trying various things. In particular, the teacher gave me a lot of tests in most of the lectures, which was very helpful. I had no idea how to do the tests, but after watching the lecture, I got a sense of what and how to study. Thank you for teaching me how to use a fishing rod rather than giving me a fish, and opening the way for me to study on my own.