I can't help but say, "As expected~". It makes me realize the important difference between simply using it and being able to explain it. I feel blessed to be able to hear such a comfortable and easy explanation on a complex topic, so I think I'll be happy every day. Thank you~ I've been making a living as a developer for over 20 years, but if you're using Spring, I highly recommend that you listen to Toby's lecture before listening to other lectures. I would also like to recommend this lecture to developers or engineers who don't necessarily use Spring.