Since it's a casual concept, I'm leaving a casual review too. First off, the lecture content and structure are good! However, the problem is that since the lecture content is organized in a Namuwiki style, from the point where you pass 25 percent of the lecture list or when reviewing, it feels like you're being consumed by the concept. Learning content A - (concept) - Learning content B (concept) - this repetition made me feel a bit frustrated when reviewing.