Pros: 1. The lectures on DirectX 12 version are really very few books, so the initial setup part is really too difficult. Especially the contents such as root signature.. 2. The lectures are similar to the Unity engine, and the engine is continuously improved. 3. It was good that the math-related parts were given with proofs in the middle. I didn't study by memorizing or taking notes, but it was a convincing understanding method. 4. Although there are very few direct x 12 lectures, the price is relatively reasonable compared to that. Cons. 1. I only roughly looked at the direct x 11 book, so I think some functions are missing (e.g. blending for transparency, mirrors, etc.) -> Smart people can apply it, but people like me can't ㅜㅜ 2. Sometimes the instructor's words get twisted. When that happens, my brain gets twisted too. Conclusion -> DirectX 9 is possible by studying from a book, and 11 seems possible if you spend a lot of time studying. I gave up on 12 because the root signature setting for the constant buffer was too weird. I think I would have watched 9 and 11 if there were good lectures... Other academies charge about 1.2 million won for a full course, but compared to that, I think this is a quality lecture. It was hard to watch the whole lecture. I didn't spend a lot of time focusing, so I don't think it will stick in my head much, but I still think it was a good lecture.