The workspaces are all the same in what you /can/ do, but not in what in
you /are/ doing at any one time.

So for instance in any workspace you can run LibreOffice, and in any
workspace you can use it to edit a file called MyDoc.odt, and in any
workspace you can use it to edit a file called OtherDoc.odt.

If you want both documents open at the same time, without workspaces (as
in Windows) you open them both, and minimise one to the taskbar while
you are working on the other. With workspaces, you can open MyDoc in one
workspace, and OtherDoc in another workspace. It's just a somewhat
different way of organising the work you are doing at any one time.

That's the be all and end all of workspaces, as I understand them.