I owe for a project to install Kali Linux for a server but I have worked little with free OS and I need help to install and configure it. If you have information on how to install it but as a server not as a normal machine and in VirtualBox I would appreciate it very much.
Kali Linux is a distribution developed only for Desktop, so it does not have a server-specific version, but it can be used without problems. It is a server since it is Debian-based, you only have to install it as if it were Desktop, in the following link it is The step by step explanation of how to install it: link
Additionally, from the following link you can download the .ova file (both VirtualBox and VMWare) directly from the Kali / Offensive Security page in which it is already installed: link