Cloud instances are command line only $($no GUI$)$ operating systems. It is therefore imperative to know how to use a command line text editor like nano. How do you save an exit from the nano editor after creating or editing a file?

Press $Ctrl+S,$ then $Ctrl+x$

Press Ctrl $+$ W$,$ then $Ctrl+E$

Press $Ctrl+O,$ then $Ctrl+x$

Press Ctrl $+$ Z