tag management

Hi there, is there any way to see which tags only apply to one item?
Also: is there any way to rename more than one tag at the same time?
Related: is there any way to select more than one tag when they don't belong to the same item?
I haven't quite figured out the use case of coloured tags (apart from people wanted them) are they supposed to have some kind of hierarchical tagging function?
I'm sure, years ago, there was a request for hierarchical tagging, is that still on the agenda?

Sorry for the abruptness - don't often use tags and mine are a disaster zone, even after deleting the automatic additions -- I suspect many of mine were too old to be cleared that way. So now I'm looking at trying to organise them and yikes.
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