A how-to is an informal, often short, description of how to accomplish a specific task. A how-to is usually meant to help non-experts, may leave out details that are only important to experts, and may also be greatly simplified from an overall discussion of the topic.
Since Kali Linux 2016 came out (also known as Kali Rolling), it seems that Official VirtualBox guest addition doesn’t work well anymore. It also created lots of confusion and debate …