Throughout this book, we're going to use a number of penetration testing tools. You can go ahead and install each of these tools manually, or you can do what most pen testers, including myself, do—save time and effort by using an operating system designed for hacking. We're going to use an operating system called Kali Linux, a flavor of Linux based on Debian. It comes with all of the programs and applications that we need to use, preinstalled and preconfigured. This means that we can just install the operating system and start to learn hacking.
There are two options for installing Kali: install it as a virtual machine inside the current operating system or install it in the main machine as the main operating system. Throughout this book, we are actually going to be using it as a virtual machine, because using it as a virtual machine works...
