It was great to be able to quickly skim through the overall flow. It was particularly helpful to be able to summarize technologies like server optimization, Redis, and Kafka all at once, even if only briefly. I was also impressed that the content was centered around technologies frequently used in practice. However, the lecture explanations were somewhat brief, making it difficult to understand the content without prior background knowledge. It would be better if the context or reasons for "why we use this technology" were explained in more detail. Additionally, reinforcing visual materials (architecture diagrams, flowcharts, etc.) would be a great help for understanding. Furthermore, regarding the use of message queues like Kafka or RabbitMQ, it would be even better if you explained what specific advantages they offer compared to other methods, rather than just saying they are "widely used." While Redis is also commonly used for caching, providing comparisons with other alternatives or actual selection criteria would make it more convincing from a learner's perspective. Overall, it was a good lecture for giving beginners a sense of direction, but I think the quality would be much higher if the reasons for choosing each technology were covered in a bit more depth. The value for money is also a bit disappointi...