I thought I knew a little about Redis... but I realized I only knew a little. First of all, it was amazing to implement the Slave Node directly, and in addition, the function itself is written simply. However, I think the content you are talking about is very useful, and when I listened to the end, I learned about caching strategies and various methods that I did not expect, I think this process was a great help to me. Personally, I think the last content was the most helpful. Thank you for the good lecture :)