I listened to it all the way through the first time, and followed it from beginning to end the second time. Overall, it was a clean source without any unnecessary details, so it was a great lecture to study and I was able to learn a lot. However, one thing that is disappointing is that despite being a Flutter lecture, it is only available for the Android version. If only this part could be improved, I am confident that it will be an excellent Flutter lecture that includes almost all the functions related to chat. Thank you for your hard work preparing the lecture.