Pull-down menus represent the standard way to interact with a macOS program. While your program may display buttons to represent commands, too many buttons can clutter the screen. To avoid trying to cram multiple buttons on the screen, you can group related commands in multiple pull-down menus. By default, Xcode creates every macOS project with the following pull-down menu titles:
File: Displays commands for opening, saving, creating, and printing
Edit: Displays commands for copying, cutting, pasting, undoing, and redoing commands
Format: Displays commands for modifying ...