Any scientific laws are truths, I can tell ya that right now.
These seem like pretty good candidates for truth. As do analytic truths, like all bachelors are unmarried males. But just for fun, I'm going to play the role of a Quinean (well, really a neo-Quinean).
So, for your philosophical enjoyment, I posit the following:
No proposition can be true simply by itself, but only when understood within a framework of other beliefs. It's how the beliefs fit together, or cohere, that makes them true.
Now I'm not appealing to some higher notion of truth, some meta-assessment of propositions. Such talk is absolute nonsense. How would we go about comparing some ordinary proposition to this higher order standard?
It seems like what philosophers who are concerned with truth are really worried about is whether a belief can turn out to be false. As a principled account, this would only leave us with necessary truths, which would result in severe skepticism. They could also mean certain token beliefs that couldn't be wrong in the actual world. But this looks more like a waiting game, where a cognitive agent might refuse to assent to a proposition until it's certainty in the actual world were somehow assured.
The problem with all this is that it's fundamentally flawed. There's no such thing a necessary truth. Think I'm crazy? Consider Euclid's Parallel Postulate.
If you don't know EPP, then a quick Google search will fill you in. Needless to say, for quite some time, this looked for all the world to be a necessary truth. Until, that is, non-Euclidean geometries started sprouting up!
Even a "necessary truth" like 2+2=4 is only true in virtue of our stipulations of what "2", "+", "=", and "4" mean. And if these statements are merely stipulations, then they don't tell us how the world actually is. I think you may be hard-pressed to show a statement like that is even a genuine proposition.
We must be ready, at any moment, to give up even our most core beliefs. There are certain truths upon which many other truths are founded. But if those core beliefs end up being replaced by a more effective, coherent system that has more explanatory power, then we should welcome the change.
So, while truth certainly isn't relative - it's also not certain.