I think this is the best course in learning the basics of system hacking. While looking for a course to learn and practice general knowledge of system hacking techniques, I found a course called Proto Star Tutorial that I could study sequentially. After checking the course introduction and examples, I thought, "Oh, this is what I was looking for," and started studying the course. As a result of attending the course, I was able to study general knowledge of system hacking very easily and sequentially, and I was able to learn and freely use various system hacking tools such as network programs and gdb as well as basic knowledge of vulnerabilities. I think it was very helpful in understanding the principles and analyzing the system. In particular, the course seems to have been created to make it easy for beginners to study exploits, so I highly recommend this course to beginners of system hacking.