@ahronmoshe, I agree with @LegendHacker and @ChefByzen.
Basically, as you work through boxes you will find tools you like/need/want and install them.
Life is easier if you find a way to store them in a common folder (/opt/ is a common choice, but it is a choice).
If you have Kali, you may well have some useful stuff in /usr/share/ which is worth getting to know. If you are after shells /usr/share/webshells/ has a few worth looking into grouped into technologies.
It is 100% worth the effort of looking at what is already on your Kali system (people often forget the files in /usr/share/windows-binaries or /usr/share/windows-resources/binaries exist)