|| Hi there! Seems like I can help you out a bit.
I know it is tempting to think that knowing how to use tools on Kali Linux will make you become a good hacker, but no... There are things to do before you jump into studying hacking tools and techniques. Like dy0025 mentioned above, you should really study English since most of the technical documentations are in English and there are just so much more opportunities that can be available to you outside Korea.
Now on technical aspect, you should follow this hackerschool's curriculum starting from the kindergarten section. You will be able to study basics of C programming, Linux, networking, etc. From that point on, things will hopefully start to make sense when you come back to studying Kali Linux. But remember, "with great power comes great responsibilities"!