I understand that renaming a header auto-updates links only if you use the dropdown menu to change its name, but… how to tell whether I should be worried whether a particular header has backlinks? If there are no backlinks to the header, then I can edit its name very simply (without using dropdown menu).

I am aware of the backlink pane but that seems to list backlinks pointing to the current note. What about backlinks that point to a specific header within the note?

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You could use the Block Reference Count plugin which shows a reference count beside a header/block when it is linked somewhere else.

It won’t show the header’s backlinks but should suffice for your need

Edit:
Tried the plugin and clicking the reference count actually shows the backlinks :eyes:

Thanks for the tip. The preview video on the GitHub site appears to be a broken link.

A brute-force method I’ve been using is to scan the backlinks for the file to see if any links contain a format note-title#header-title. That is obviously quite tedious.

I’ll fix the link. The plugin basically does what you want.