Hello, Hobin An. Thank you for leaving your feedback. I fully understand that you felt the explanations and practice sections were lacking. However, as mentioned in the course description, this lecture is designed for those with a certain level of development experience and focuses on core concepts. Therefore, from a beginner's perspective, the explanations or practice exercises may feel somewhat insufficient. The English explanations were included to assist with learning, but I agree that they can be perceived differently depending on the student. Based on your feedback, I will work on improving the course by supplementing the explanations and examples so that it can be more helpful to a wider audience. Thank you for your valuable opinion.