Because I am a working person, I divided it into 4-5 days and completed it. I read it twice and typed the code twice! I was satisfied because it was a general basic lecture on Flutter. However, the library used in the lecture was old and did not match the current source code, so I was very short on time from the external library part. I didn't think to look up the source code separately and solved it by Googling a lot, so I unexpectedly learned more. If you are listening, you should go to the GitHub link that the instructor uploaded to see the source code from the part where the external library is used and listen to it without any difficulties. Even though the lecture is old, there is after-sales service, so please listen without any burden, and after listening to this, you can completely learn the basics of Flutter. I highly recommend it. I listened to this lecture and purchased the rest of Professor Oh Jun-seok's lectures at a discounted package. Tips for those who are listening 1. For the external library part in the middle, just understand what functions it does through the lecture and follow the actual source code by going to GitHub and following it. 2. Go to the actual external library site and look at how to use it. 3. Try the code at least twice.