Besides CTRL+SHIFT+C/CTRL+SHIFT+V to copy/paste in terminals, there are some other alternative mappings for common functions that I like to use sometimes and which work pretty widely:
ctrl+insert for copy and shift+insert for paste are still a thing in the majority of places in Windows, though I think only the ancients like me use them (people newer to the game being taught ctrl+C & ctrl+V from the start).
Not long ago I even spotted it being usable in an app that blocked ctrl+C/ctrl+V.
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