I applied and watched it all at once! This course is introduced as a course for beginners, but I think it's content that will be helpful to everyone in the IT industry! When you're running towards your goal of studying, getting a job, or changing jobs, you can easily get caught up in the 'trees' and not see the 'forest'. (That's what happened to me...😭^😭) Even before taking the course, I had heard of and knew concepts like 'search engine' and 'scale out'. However, I didn't systematically organize and understand why they were needed and how they developed after implementation. So if I had explained the content covered in this course, I would have ended up focusing on specific concepts (trees) that I knew the best. However, this course allows you to naturally understand how these concepts are connected and expanded into a huge service that handles traffic from all over the world!! Thanks to this, I was able to look at service design from a broader perspective! The course progresses in a way that makes it feel like one thing leads to another, so it was so fun that I watched it all at once, but I think I'll be checking it out often in the future!