On Linux, Control-C and Control-V don't work for copying and pasting in terminals. The Control modifier is used for its original purpose of inserting control codes. Instead, terminal apps require an extra Shift modifier, like Control+Shift+C.
But what if there were hidden shortcut combos for copy and paste
The article doesn’t suggest using Control+C. It talks about dedicated copy and paste key codes, and you can program your keyboard to map those codes to whatever keys you like. They suggest Fn+C.
standards.xkcd
We could use Ctrl+Insert and Shift+Insert like in the last three decades, but some of these keyboards apparently forgot about the Insert key.