Hello, thank you for your feedback. I'm sorry that you were disappointed with the lecture content. As you can see in the page guide, this lecture is prepared for beginners of Amplitude. As you can see in the curriculum, it was created for beginners, from the concept of data taxonomy to the Amplitude practice environment and the basic concepts of each chart. Therefore, unfortunately, the explanation of the concept of each function cannot be different from the explanation officially provided by Amplitude. For those who already have some experience and understanding of Amplitude, like you, it may have been disappointing. We are also preparing a curriculum for intermediate and advanced users, so please look forward to it. Thank you. Since the curriculum was planned directly by A to Z mentors and demonstrated directly as you saw in the lecture, the part you said, "I copied the help from Amplitude as it is," may be misleading. If you could explain in detail the part you felt that way, we will look into it and revise and reflect any misleading parts.