undo.copy.redo.paste

Undo/redo & copy/paste are ubiquitous across all productivity software & this is no doubt because they are impossibly useful, even if we often take them for granted as mundanities. In combination & with care, however, they can perform downright miracles.

You probably already know that when you dig through your undo history, any changes make while you're back there will erase all the steps that had come after. As Doc Brown explained to Marty in Back to the Future Part II, making a significant alteration to the past will skew your reality into a new timeline & you will lose access to the one you came from.