It was such a great lecture that I wanted to call it my life's savior. In other lectures, I got really deep into the theory by looking at the official Spring documentation from the beginning, so as a beginner, I couldn't really understand or grasp what role it actually plays, so I got tired easily and gave up. But this lecture is different. After going through a simple round of how it actually works, I could feel what problems Spring solves and what DI is. It was also good that he showed me the process of solving an unexpected error that occurred in the middle. The warm and affectionate way of speaking of the instructor made me smile while studying^^ Kim Young-han's lectures are really not boring. I only memorized the Spring theory for interviews and didn't know how to use it, so I suffered a lot at work due to the gap between theory and practice, but now I think I know how to study. I will continue to listen to other lectures and work hard. Thank you so much!!!