I took my first step into PWA. Thanks to the kind and detailed lecture, I was able to get started with the unfamiliar technology called PWA. I think many people are already using it, but there are still few related books, so I was at a loss. Thanks to this, it was a great help in getting started. However, if we could receive the sources or lecture notes explained in the lecture in advance, we could reduce cases where we can't focus on the lecture because we have to fill them out one by one. It seems difficult to disclose it due to copyright, but since it can be leaked in other ways, I hope that it is provided to the lecturers in PDF format or as a summary. In my case, it took some time because I made an error while following it.