The question "What is truth?" is as old as the hills. And it's an important question, right up there with "Who am I?"
The tendency is to make it as abstract as possible by seeking the "ultimate truth" as opposed to finding what works. This, to me, isn't very useful and it smacks of avoidance. Because when we stick to what works, we're then responsible to follow through with it, at least until something better comes along. It makes us accountable.
But we have to look beyond our own opinions, which means we have to seriously consider the opinions of others. And we have to do it in good faith and not just to be right. From this, we can see that the approach to truth must be collaborative.
We have to be VERY careful not to slip into relativism. We should avoid saying things like "this is my truth" or "that's your truth." This is a real problem because it undermines collaboration.
The point isn't to win the truth game but to work together towards solutions that work best for everyone.