I'm using gvim for text editing.
Some shortcuts are listed as
However those precise key combinations do not work so I suppose that + and g might be abbreviations for other shortcuts. How can I figure this one out?
Usually you can just use
As gvim, like any other vi derivative, isn't intuitive to use you really should read the handbook in the Help menu.
The confusion here is that you might be pressing those keyboard combinations in editing mode.
Make sure you are not in editing mode before doing exactly that. Type, one by one:
Then when you press enter it will copy what's in your clipboard.