As the lecture progresses, it progresses too quickly without explanation, so I'm busy following the code. In addition, it's a flutter lecture from 2 years ago, so it's a lot different from now, so I'm getting stuck more and more. Because of that, I'm so lost and it's frustrating ㅜㅜ.. I wish I had known the lecture update date and such issues in advance before paying, but it's a shame.