Although Linux is the most secure operating system on the market, you can still improve it further. One such tweak is to enable the firewall. Surprisingly, most distributions ship with the firewall disabled, and Zorin OS is no exception.

This is something you should do right out of the gate, and fortunately, there's a GUI that makes this task easy.

Also: Your desktop firewall isn't enough - here's how to protect your entire network

To enable the firewall, open the desktop menu, type Firewall, and click Firewall Configuration. You'll be prompted to type your user password before the app opens.