Unless your computer is exposed directly to the internet, your router’s firewall should be enough. Fedora typically has SELinux and AppArmor enabled by default which should protect from something nasty executing on your machine.
Don’t execute things as root if you don’t know what it is and you should be fine.
I was recently diagnosed epileptic and I’m starting to experience this phenomenon where I’m unable to tell the difference between dreams and reality.
I’m not even supposed to be driving yet, but I was under the impression that I had been for a while (in my dreams) only to find out my odometer hadn’t changed when I tried to drive IRL. Really jarring.