I am a developer who has been developing for more than 2 years. First of all, when I first took the Java class, I remember it being very difficult. However, I was able to broaden my understanding of Java by continuously looking at the Java source code on site and also by taking the first lecture of TPC. Hmm... I will tell you a different story from the course review. To be honest, I paid for this course in November of last year, but I ended up taking it late, a year later. At first, I didn't know how to take the online lecture, so I was lost a lot, and because I was busy, I ended up completing the course after a year. There was a gap of more than 6 months in the middle where I didn't take the lecture. However, since October of this year, I have been trying to take the lecture consistently because I had time, and that is probably why I ended up completing the course. Some of you who are reading this article may be new to development, and there may be many seniors who are more experienced than me. If you want to listen to the lecture more effectively, I recommend doing the class, object, inheritance, and interface examples from the Java book. However, if you have too little time and get busy in the middle, it seems like it gets lost. So, if you follow the examples in the lecture, I think you will understand 70-80%. Also, if you create a separate git account - if you have already created one and are committing and merging the lecture content, it doesn't matter - if you leave comments about things you need to know and things you didn't know and commit and merge them, it will be easier to find them later. You can find what you did by just following the merge history in git. If you don't have a git account, it would be good to create a separate git account and always merge the TPC practice sources. Lastly, there may be some people like me who want to give up on the lecture because they are busy or find it difficult. Computer language is not something that people can understand right away when they first hear it. If you stop listening to the lecture because something comes up in the middle, you will forget the content. If you are reading this article and you don't understand the content you heard before, it would be right to listen to it again, but if not, I think it is important to review the PPT materials and practice sources sufficiently and progress. I wrote it without any order, so it became long. Even someone like me who had a long gap in attending lectures(?) completed the lecture. If you also listen to this lecture - it is the same as any online lecture - with consistency and earnestness, you will see yourself standing at the top of the mountain called completion. I hope you all will not forget the original intention when you paid for the lecture and complete the lecture. I will now go listen to the second lecture of TPC. Thank you for reading the long text.