I was preparing to get a job as a front-end developer, and somehow I ended up getting a job at a company that uses Xplatform and Spring. I somehow managed to get the job done, but it was really hard. No matter how much I learned, I could do it, but when I didn't even know Java, they suddenly told me about Spring... I studied Java steadily after work and understood it, but Spring was the problem. It's clear that the things I need to know at work are limited, so if I just get the flow, things will be easier, but if I listened to all the extensive Spring lectures from other people, I felt frustrated because there was no content that I could apply right away when I had to work. I searched and found this lecture by chance. It felt a little expensive compared to other lectures, but after listening to it all, I don't regret it. I still have a lot to learn, but this lecture helped me organize the big picture. Thank you.