I bought a presentation book, but I couldn't keep reading it. The book was a bit boring because it was a technical book, but it was good that it was recorded as a lecture. Since it was conducted as a video, it was also good that I could listen to it while doing other things or moving around! The lecture content was created by a presentation expert who applied both theory and practical experience, and only pointed out the 'most important key elements when giving a presentation', so it was very efficient in a short period of time, which seemed to be the best advantage!! When the appropriate hearing and visual tools were shown in a video, I thought, 'Oh, that's right! That's how you do it, so it's really sinking in!!', and my understanding doubled. I usually work in face-to-face consulting, but I think I can apply and use not only presentations, but also the most important part of my work, how to handle questions, in real life. I'm satisfied that I was able to listen to a good lecture. I recommend this to anyone who uses Infraon and needs to make a presentation!