reply to u/throwthis_throwthat at https://www.reddit.com/r/antinet/comments/13gcbj1/requesting_advice_for_where_to_put_a_related_idea/
I don't accept the premise of your question. This doesn't get said often enough to people new to zettelkasten practice: Trust your gut! What does it say? You'll learn through practice that there are no "right" answers to these. Put a number on it, file it, and move on. Practice, practice, practice. You'll be doing this in your sleep soon enough. As long as it's close enough, you'll find it. Save your mental cycles for deeper thoughts than this.
Asking others for their advice is fine, but it's akin to asking a well-practiced mnemonist what visual image they would use to remember something. Everyone is different and has different experiences and different things that make their memories sticky for them. What works incredibly well for how someone else thinks and the level of importance they give an idea is never as useful or as "true" as how you think about it. Going with your gut is going to help you remember it better and is far likelier to make it easier to find in the future.