This is a good lecture that even beginners can listen to, and it may be repetitive, but I think it's a good lecture that builds the lecture together by actually writing each one. I haven't seen a lecture that actually operates Redis and handles Ping for each node, and it was a concept I had never seen before, so it was very useful. This lecture uses Spring, but I think it can be evaluated as a very good lecture even if you just learn the conceptual part. - So I actually followed along in the language I use and implemented it myself. Thank you for sharing a good lecture!