Kali Linux is a very simple and at the same time complex operating system that has, on the IT side, in addition to the most popular application, because penetration testing has many other applications that can effectively manipulate some kind of IT system. It has applications in any aspect of IT, the system contains a large number of tools that serve for various possibilities in all fields where Kali Linux can be useful. The paper shows what applications there are with this system, what these applications are for, and some of the best ways and tools that can be used a little to achieve this application. The work is intended to be a guide through all the possibilities it provides, of course, penetration testing is in the first place and when we divide the whole process into smaller parts, we get applications that can serve us separately on their own, as well as for displaying applications that are not part of penetration testing they already have their benefit separately for themselves.