You can also re-size the window's borders by moving the pointer over a border. Left mouse click in the window's title bar. The title bar is the colored bar that runs along the very top of the window. Drag the window to where you want it displayed. You can also click on File from the menu bar, drag down to Exit and click.
Menus are a group of commands across the top of any window.
There are additional sub-commands under the main headings. These are accessed in a pull-down menu manner from the main menu headings. An example would be when the Paste command is greyed out, nothing has yet been copied to the clipboard. Dialog boxes are boxes containing choices from which Windows needs answers input by you. You can only pick one.