Install Kali Linux on virtual box and create virtual machine for Penetration testing, the basic requirement installed virtual box and Kali Linux ISO image. Kali Linux ISO file is available on it’s official website.Download Virtual Box Download Kali Linux
When you acquire executable file of Virtual box install it.
When virtual box installation will be finish run virtual box and create new virtual machine for Kali Linux. At the time of creating virtual machine be aware and follow every steps, because your wrong move can make installation failed.