OK sounds like you are doing fine, and have earned yourself a stubby or three 
Remember that password, whatever you do.
Despite the video calling it a root password, it is not.
It is actually a user password, aka admin password or sudo password, and you will use it for a number of tasks, both in desktop applications and in the Terminal.
Linux Mint (and Ubuntu) do not have a Root password by default, but they can be set up if needed.
I can't remember if you have said you have wifi with your Aussie Broadband or if you just use Ethernet plugged in to a wall socket.
In any event, one of the first things you do should be to enable your software firewall on Mint.
Open the Terminal with Ctrl-Alt-t or find it in your Menu, and type and enter
and you will get a message saying the firewall (Uncomplicated Fire Wall) is enabled instantly and it will run every time you boot or reboot the computer.
Cheers and
Avagudweegend
Wiz

Remember that password, whatever you do.
Despite the video calling it a root password, it is not.
It is actually a user password, aka admin password or sudo password, and you will use it for a number of tasks, both in desktop applications and in the Terminal.
Linux Mint (and Ubuntu) do not have a Root password by default, but they can be set up if needed.
I can't remember if you have said you have wifi with your Aussie Broadband or if you just use Ethernet plugged in to a wall socket.
In any event, one of the first things you do should be to enable your software firewall on Mint.
Open the Terminal with Ctrl-Alt-t or find it in your Menu, and type and enter
Code:
sudo ufw enable ufw
and you will get a message saying the firewall (Uncomplicated Fire Wall) is enabled instantly and it will run every time you boot or reboot the computer.
Cheers and
Avagudweegend
Wiz