I was impressed by the part where he explained the development from simple inheritance concepts to modern C++ methods. There are almost no textbooks that properly explain this part. I am learning programming while studying abroad after working as a designer in the field. The most difficult part while studying was that the design methods of the materials in other books or lectures and the codes posted by numerous professionals on the Internet were so different that I wondered why. I realized the reason through the professor's lecture. Thank you for making such a good lecture at this price. I am also interested in graphics, so I look forward to the next lecture!