Hello. Following the last JavaTPC lecture, I completed the JavaTPCProject practical lecture. In JavaTPC, I learned about the basics of Java (classes, object-oriented programming, polymorphism, interfaces, etc.), while in JavaTPCProject, I learned 6 examples based on those basics. I was very confused from the beginning because of the difficult and complicated terms like InputStream and OutputStream. However, I pulled myself together and gradually listened to the lecture, and I learned 'this is what it is used for', and I looked up the parts I didn't know by Googling them. It was really a difficult process to complete the lecture. However, since JSON and Excel are used a lot in practice, I think I completed this lecture to learn those parts properly. In particular, I was very impressed by the project using Naver API. In the past, I used the word API vaguely and didn't know much about it, but I learned a little bit about how to use it by actually using it. And in the future, when I use SPRING for web development, I thought that I could show more diverse information to users by using the API provided by the portal site. I will try to implement this part once next year (2021). Those who have taken the JavaTPC lecture, if you only listen to the first part of the JavaTPCProject lecture, you will think, 'I don't understand', 'Why is this suddenly popping up?' However, in actual projects, there are many cases where data is exchanged using files. So even if you don't understand the first part of the lecture, I hope you will refer to it and finish the lecture. If you are too busy and don't have time to listen to the lecture, I strongly recommend that you listen to the JSON and Excel parts. As I mentioned earlier, they are used quite a lot in projects. (JSON is used a lot when exchanging data between the front and back, and Excel is often executed when the retrieved data is downloaded to Excel.) I wrote the text without any order, so the beginning and the end of the sentences do not match. This part, I would like to ask for your understanding from those who read my course review. I have now completed the second online course, and next year, I will complete three or four more courses beyond two to grow into a developer who can help in projects. Thank you!