Updating links/ relinking
I cannot recommend Relink enough, I can’t imagine TW without it. You can’t go wrong with it. This is not to say TWCrosslinks is not good, but I haven’t heard about it, so I can’t say.
For basic usage, you don’t need to configure anything about Relink, just have the plugin active and it does its magic whenever you rename tiddlers.
It recognizes not only normal links like [[Crop varieties]], but also more complex references, like <<toc "Crop varieties">>, and all of them will be updated if you rename the “Crop varieties” tiddler.
All core macros are recognized and “understood” by Relink. If, later, you create your own macros, you can easily make it so that Relink understands them as well, and updates titles referenced in them.
Also, Relink adds a “Relink Backreferences” tab to the tiddler info. This tab shows all backreferences to the tiddler, not just backlinks.