Final answer:
To recover mistakenly deleted text or an object, use the undo feature with Ctrl + Z on Windows or Command + Z on Mac, allowing multiple undos if necessary.
Step-by-step explanation:
If text or an object is mistakenly deleted, the best action to take is to use the undo feature which can be triggered by pressing Ctrl + Z on a Windows PC or Command + Z on a Mac. This keyboard shortcut is a common feature in many software applications, allowing you to revert recent changes and restore mistakenly deleted content. If additional actions have been performed after the deletion, most programs support multiple levels of undo, letting you step back through each action one at a time until you reach the point where the text or object was removed.