Which keystroke in nano allows you to exit the editor?

In the nano text editor, exiting the program is accomplished with the keystroke indicated by the combination of the Control (Ctrl) key and the letter X, which is represented as ^X. When you press this combination, nano prompts you to confirm whether you want to save any unsaved changes before exiting. If you have made changes to the document and attempt to exit, you'll receive a message asking if you'd like to save these changes, giving you the option to save or discard them before closing the editor.

The other keystrokes serve different functions: ^O is used to save the current file, ^C shows the current cursor position and other details (commonly referred to as the ‘current context’), and ^G opens the help documentation for nano. Each of these commands is essential within nano but does not serve the purpose of exiting the editor.