I don't usually leave reviews, but I'm leaving one for future students. Knowing a lot and teaching well are definitely different. You may be confident as a professional, but don't make a paid course with the narrow-minded idea that if you know it, everyone else will know it too. It's precious money and time for some people. The lecture was only 10 minutes long, but the lecture notes were revised during the lecture, the difficulty level was high, there were difficult examples, and the explanations were lacking. It was a very disappointing lecture.