I think it was an informative lecture that allowed me to get an introduction to and learn new concepts in data science in just about two hours. Until now, my knowledge of databases was limited to SQL concepts for writing queries that respond to API requests, and at most, designing table relationships. However, I found it truly beneficial to take a step further and take my first steps into the actual approach of how to process data required for practical work flexibly while maintaining its original form as much as possible. Please continue to provide great lectures in the future.