Hello, Jeongtaek Kim. Thank you for taking the course, and I will answer your question regarding additional database studies. First of all, while there are many lectures related to database creation and management tutorials (How), I have determined that there is a lack of lectures or materials that concisely cover the fundamental principles of databases (Why), which is the intent of this course. Therefore, I am planning to produce additional lectures and materials. I will provide an announcement through the course news as soon as possible. Thank you :)