You can learn about Spring by reading the official Spring documentation, books, or searching without taking this course. However, this method is much more difficult than you think. Also, it may take a lot of time to deeply understand the principles because there are not enough examples or because of unfamiliar concepts. Mr. Kim Young-han kindly explains the principles of Spring so that even beginners can easily understand them. And he talks about the problems he encountered in the field, and through this indirect experience, you can understand the technology better. Time is a limited resource. So I think it is really fortunate to be able to learn the technology called Spring so quickly and effectively. Thank you for the great lecture.