We don't really need to go into to much more detail here, but be aware that there are certain key commands that are much simpler to use in the terminal or console for Ghost's operation.
Which ever method you prefer, the commands are as follows:
$ service ghost restart = Restarts the Ghost server
$ service ghost stop = Stops the Ghost server
$ service ghost start = Starts the Ghost server
$ service ghost status = Current status of the Ghost server.
You'll need to use the first one when adding major updates, plugins or changing the theme.