Try making it with limited knowledge!! Through this study, you will realize that it is important to try making it yourself again!! Although it is still lacking, I learned a lot through lectures and trial and error in a short period of time. Try making it based on the lecture content!! If it doesn't work, then you can find a method through Google search or Java textbooks. It was a good opportunity to quickly experience the Java language, from basic study methods and Git usage to file input/output at the end. However, if you are just starting to study computers for the first time, you may have difficulty understanding the latter part because of the fast progress. Therefore, it would be better to proceed little by little while studying Java textbooks in parallel without rushing.