I've always found concurrency issues difficult to grasp, but this course broke down the concepts step by step, and I finally feel like I'm getting the hang of it. Rather than just covering theory, I was able to naturally understand how concurrency issues manifest differently in single-server versus distributed-server environments by setting up hands-on practice environments. What I particularly appreciated was the structure that allowed me to directly observe the process through which concurrency issues actually occur, so instead of simply memorizing concepts, I could experience firsthand why these problems arise. There was a lot of content that could be immediately applied in real-world work, which was very helpful. I think this is a course worth recommending to anyone who finds concepts like optimistic locking, pessimistic locking, and distributed locking confusing, or who is struggling with how to solve concurrency problems.