The most difficult thing about learning development in 2023 was understanding why. At this point, many parts have been abstracted, so it was really hard to take apart the code in reverse. Honestly, sometimes I envied people who had started development before and experienced the development stage firsthand. But if I just knew that the framework provides these things, so I could just use them in this way, I felt like I was just learning how to use them without really knowing how they worked. When I encountered a usage method that I didn't know, it felt like a completely new concept, so I was psychologically stressed, but this lecture allowed me to experience gradual development. If I had just learned how to use them and was at the stage of using the framework, I wouldn't have been able to understand them even if I took a more in-depth lecture, but now I think I can. Thank you!