Here is the video version, if you prefer it:
Upgrading your packages means installing newer versions of them. You do so by running: (Shotts, 2019)
apt-get upgrade
You do need to prefix it with sudo.
Hope you learned something useful!
References
Shotts, W. (2019). The Linux Command Line, Fifth Internet Edition. Retrieved from http://linuxcommand.org/tlcl.php. Pages 201-202