I have taken lectures on various fields (real estate, big data, smart stores, etc.) online and offline for a lot of money, but there have never been lectures of this quality. To summarize briefly, 1. Amount 2. Structure 3. Quality 4. Special lecture sessions held every week 5. Weekly quizzes (about 1 hour) 6. Immediate Q&A (they have also organized other Q&A from previous classes.) 7. Community where you can communicate with previous classes 8. Study space where each class can be active - The amount, structure, and quality of the lectures are amazing. In addition to the 251 classes here, there are over 300 lectures including additional sessions and other lectures, and I have never skipped any of them. It is very well organized. The app creation project even teaches you how to search for questions on Google, and it's a lecture that even puts food on your spoon... That's Alan's lecture... If you absorb and practice only half of the lecture, you can easily get a job as a new employee based on my experience as a current employee. While taking many lectures other than those in the development field, I feel that lectures that mass-produce knowledge at a low price and with low quality are a waste of time and material, so among the existing iOS lectures, I strongly recommend Alan Swift Grammar Master School. Good luck to the 12th class!