The lectures mostly teach theoretical knowledge or content that can be used mainly in practice. If you don't just understand what the teacher teaches, and think a lot on your own, you will find yourself developing before you know it. Previously, I didn't know exactly how to write a program, how external libraries work, and how to use them, but through this lecture, I gained some confidence and understood the advantages of object-oriented programming. If you just learned C++ and want to leave some results and understand object-oriented programming more, I recommend it. I implemented a game where you break blocks with a ball, and I think I really gained a lot of experience by implementing blocks, balls, items, and interactions myself. It was harder to implement it myself than I thought, and I think I learned a little bit about what real development is by developing the habit of Googling and thinking for a long time in the process. And it was rewarding and fun to create functions one by one.