Hello. I am leaving this review after completing the course. Recently, I tried building several apps by introducing AI like Claude and Codex. Although I managed to create them with just a few "clicks," I hit a major wall when it came to modifying internal functions or expanding and maintaining the code. Because I lacked the big picture and fundamental knowledge of development, I could only ask fragmented questions like "Do this" or "Do that." As a result, I ended up wasting tokens without getting the desired results, which was very frustrating. I realized that while AI will eventually produce an output, it is ultimately a loss if the input cost is excessive. Seeing inefficient development become a reality with high costs made me feel a sense of crisis—that it will be hard to survive in the future without solid core competencies as a developer. I used AI to save time, but as the burden of token costs grew too high, I felt a desperate need to improve my own software development skills and abilities. It was during these concerns that I found and took this course. Even though this was only Part 1, it was excellent for getting a broad overview. While no single lecture can teach you everything, this course certainly serves as a "guide" for what I need to study next and what perspective I should adopt. Paradoxically, in this era of AI-driven development, I believe this course is like a much-needed rain in the desert. Thank you for creating such a great lecture; I will move on to PART 2 immediately.