What does the locale command say? Have you tried to change a font?

Isn’t Quake already open source?

Why you say “Linux” when you mean “Fedora”?

Bank clients. Taxi aggregator clients.

It is easy to get hacked if you make stupid mistakes. Just don’t make them.

Security fixes are backported to ESR releases so they are not less secure than bleeding edge.

You don’t have to clean your ~/.cache every now and then. You have to figure out which program eats so much space there, ensure that it is not misconfigured and file a bugreport.