I use them very loosely, and bend them as I see fit.
Part of that is growing up in Christianity: the prophecies were numerous (for example, over 600 of them about the Messiah), but many of them were fulfilled in ways that were unexpected. The Jews thought they were getting a warrior king who would take them back into dominance like he was David reborn.
And what they got was a man who refused to lead a rebellion but instead permeated cultures to the breaking point. Rome still fell, as these prophecies predicted, but it wasn’t the way that anyone could see it coming by knowing about it beforehand.
That and sometimes a prophecy would have more than one use: for example “The Abomination of Desolation” was used for both the Greek army and the Roman army, some 400 years apart.
Or pieces of it would be scattered: Daniel showed that the cornerstone would break the statue not in the Golden head (Babylon), nor the Silver (Persians), nor the Bronze era (Greek), not even in the Iron era (Romans), but in the Iron mixed with clay era (way down to the feet). Why mixed? Well, that’s something directly from the New Testament: Christians are always called clay on the potter’s wheel. And so, these empires would fall when the last of those nations would become Christianized, split into two nations. The whole point to the statue was that the Messiah would be there to crush the end of this era as a cornerstone.
This is why Messianic Jews insist that Christ is the only one who fills the role of Messiah.
But not like it was all vague: the Babylonian prophecies that were done maybe a hundred years before Cyrus said specifically a king named Cyrus would send the Jews back home, after captivity. Dude had the old texts read to him with his name on it and so he sent them home: it was enough for him.
Then on top of this, there’s times where: did this person even know they were writing prophecy at the time?
But anyway, what I see is that prophecy is piecemeal: given over large swathes of time, imagery isn’t explained all at once, sometimes the telling has more than one use… And occasionally people are unambiguously called out by name that wouldn’t have reason to exist.
So, one “prophecy” I had was writing the story of an event that already happened in song form, that gave instructions to future generations on how to treat the same exact issue, safely, without exposing anyone who is a part of 5hat same scenario. I never called it a prophecy, but that is functionally what it was.
Another character, who sees prophecy, I give him an ever-changing future, in which he sees some images surrounding important people and those images change with everyone’s actions, over time. I allow this to eat at the character.
But the most basic is to see it as a way to have a story come full-circle, back to it’s beginning.