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Any managed package can include page layouts. So it's impossible for any help guide to give you an accurate view of what you can expect to see as far as layouts go, because it all depends on what was installed or created.
If you're not using a layout at all and it's not from a managed package, you can of course delete it. You should get a warning message if you can't (such as if it's selected for any record type or is the master). You could always recreate it.
But if it's not used by any record type or profile, it's no bother to leave it alone as well.