I finished it. In my case, I watched about 2 hacker-related lecture videos, but I needed SQL and wanted to know languages like JavaScript, PHP, and Python, so I took the SQL course. It's really helpful for beginners, and since you only taught the necessary parts, I think a lot of it will be understandable if the injection SQL lecture is uploaded later. That's because I did it backwards, so I'm only now starting to understand the mock hacking lecture. I think it would be good for those who don't know at all to definitely take the current lecture, which is a free lecture. Instructor!!! I'm really looking forward to SQL injection and future mock hacking-related videos. Please upload them quickly. Thank you.