I studied Java during the remaining time until I returned to school after my military service, and then I started taking the Spring introductory course a month before the semester started. I wish I had started a little earlier. ㅜㅜ I had some basic knowledge of Java, so I didn't have much trouble following the practical training, but the explanation of Spring went by quickly, so I finished the course, but it was a disappointing course. (I roughly understand the picture of Spring, but there were many parts of the lecture that I didn't fully understand.) Semester starts soon, so I'll pay for the Spring Complete Conquest course during winter vacation and study!