I'm learning high-quality skills. This is a lecture that's completely worth the money. I only knew basic Python concepts like classes and inheritance superficially or could only apply them shallowly. (To the extent that I could interpret the code written by the instructor) Should I call it code refactoring...? It felt like watching a video visualization of the instructor's actual work process. I also realized that I need to learn how to utilize Python's basic built-in libraries more effectively. Especially these days, code interpretation and error handling have become relatively easier due to AI, so I'm studying with AI's help for difficult concepts or interpretations in between. Thank you for providing such a good lecture at this price.