That’s exactly right. So say I found a quote in book A that is relevant to topic X and topic Y. All I have to do is write the quote out in book A, then add links to X and Y.
Weeks or months later, suppose I want to work on topic X. All I have to do is go to note X and look at the backlinks, and the quote from A will appear there. At that point I can incorporate it into the note itself.
The really cool thing is this works even with notes that haven’t been created yet. So suppose I’m interested in Y but haven’t created a note for it. I can still tag A with “[[Y]]”, and whenever I get around to creating Y, the backlink will appear. If I have ten notes link to Y, then the moment i create a page for Y, I instantly have a foundation of notes and research at my fingertips. And I didn’t have to pre-create a note, make a perfect MOC, or anything like that—all things I’d love to do but don’t have time to do for everything I think about.
Essentially I use uncreated notes as tags: anything I think I might be interested in someday gets labelled as a note. Maybe I’ll actually make a note someday maybe not. It’s better than tags for me, because if I do actually create the note I don’t have to add links to all my other notes. The moment I hit “Create,” my backlinks page is populated with all my notes on that topic.
(I actually regularly create and then delete blank notes to keep tabs on topics I don’t have time to write about. It’s fun.)
Ideally, once I create an orphan note I’ll also add it to other notes that it might be relevant to. This increases the odds it’ll be found and linked to in the future, and decreases the odds that I’ll create multiple notes on the same topic, with titles phrased slightly differently (a risk of my system). An example of this are the chapter summary link lists in one of the pictures above. But if I don’t have time do this it’s fine.
Keep in mind that this is all for low-stakes lines of inquiry, stuff I’d like to get into someday but may not have the time. I’m also a professional academic and have dedicated project pages for active research projects that are maintained much more meticulously.