added update section

getting_started/machine_setup.md

@@ -21,6 +21,13 @@ Kali Linux is a Linux distribution created for penetration testing and security
 
 That's it, you now have an operational Kali VM. The default credentials for the Kali VM are "kali/kali". You'll probably want to change that password. To learn more about using Kali Linux, check out the [Kali Linux Docs](https://www.kali.org/docs/). You'll need to get comfortable using Linux to be proficient at Hack the Box Labs.
 
+## Keep it Updated
+Kali recommends checking for updates every few weeks. Kali does not automatically pull in updates so you have to do it yourself. [This page] of the Kali docs go over how to install updates. The two commands you need to use are:
+```shell
+kali@kali:~$ sudo apt update
+kali@kali:~$ sudo apt full-upgrade -y
+```
+
 ## Other options
 - [Parrot](https://parrotsec.org/) is another good Linux distribution for hacking.
 - [VMware Workstation Player](https://www.vmware.com/products/player.com.html) is a different desktop virtualization platform.