Oh..... It's so great that I can do all of crud in 30 minutes!! There were many parts that were difficult to follow in the tutorials and blog posts about AWS, but the lecture flow was so fast that it was great! Email authentication was also a difficult part when I tried to do it alone, but I think I'll be able to apply it to many other places now that I've done it properly this time, so it's great! Thank you for making such a great lecture^^!!