I had to learn about security knowledge during a sudden job change, so I completed the course in 4 days. I really didn't know anything about security, but I was able to learn about where vulnerabilities can occur in the overall structure of the web. When I looked for lectures on the Internet, most of them seemed to only give an overview at a high level, but since there were examples, I remembered them a little more and was able to understand what kind of impact vulnerabilities have. However, I wish the setup guide for Mac users was a little more detailed. Other than that, I'm really satisfied with the lecture content.