I've completed system programming + socket + TCP/IP and even networking. Studying with the relaxed developer instructor really makes learning enjoyable. If I had to learn this content from books, it would have been thick volumes over 500 pages with small text and strange translations... full of things where I wouldn't understand why I need to learn them. I'd like to say this is a lecture that solves all these issues in one go. Finishing this kind of study in 2-3 weeks really makes me say that times have gotten so much better. (Compared to the era of learning from 500-page books, I remember it taking a month and a half just to read through and type everything once...) --- At the beginning of the lecture, since it was unfamiliar content, I was overwhelmed wondering if I could do this well. So I planned to just skim through it once and study properly on the second round! But sure enough, from the second time, it felt familiar and studying went well. Even with the given projects, after reviewing the lectures 1-2 times and trying them out, I felt like "I can do this!" However, now... Java/Spring/DB/algorithms/APM -> making high-performance bulletin boards... Since employment is the goal, I have no choice but to pass through quickly;; Anyway! I applied for the lecture because backend coding was fun and I keep studying, and it's really enjoyable! The content becomes understandable after watching it twice or more using GPT (it probably would have taken a bit longer without GPT...) Anyway, I'm spending my 30s studying enjoyably for the first time!