The Kali operating system has TWO main uses
the first :
is for pen testing by security professionals.
professionals that could teach me a thing or two yet
also ALL the tools can be installed on Debian 7
or linux mint or even CentOS 7
Kali is just a collection of custom tools
as to using Kali:
Have you read the documentation on the kali web site?
Have you registered on the kali forum?
Are you planning on enrolling in the Offensive Security courses ,
and taking there classes in SECURITY testing ?