Thank you for your honest feedback. It is true that the depth is shallow because the very purpose of creating the lecture was to help beginners with little to no IT knowledge understand. That's why I emphasized that it is a basic lecture. However, because the range of basic knowledge required to actually operate IT infrastructure is so broad, I believed that learning concept-based knowledge as easily as possible first would allow for smooth learning of subsequent knowledge, and that acquiring such knowledge easily would spark interest and gradually build motivation to explore deeper knowledge, which is why I created this lecture. For those who are non-IT majors but have taken on roles dealing with enterprise IT, there's a vast amount of knowledge to learn initially, and each concept might feel difficult, so I would appreciate it if you could view this lecture as one designed to fill that gap. I apologize for not meeting your expectations and for disappointing you. Lastly, the reason 'developer' was included in the lecture title is because the knowledge would be helpful for job seekers preparing for a developer career to know for smooth communication with actual IT operators when they eventually deal with IT infrastructure within a company. However, I apologize that you felt the level was very low, as this lecture is aimed at developers who require very basic concepts. I wish you all the best in your endeavors.