I studied Spring for a year, but I was a shameless person who didn't know anything. Now, at the moment when I was about to take off the oxygen respirator called development, after watching this free lecture by Sensei Joo-ho Choi... Suddenly, a compiler appeared in my head, and I learned the 'world that I see', and now I have become a Messi of the Spring world. I really recommend this lecture. It's more filling than a bowl of noodles.