To call a belief true is to commend it, but philosophers disagree about what that commendation amounts to. Some hold that truth is a substantive relation between what we say and how the world independently is; others locate it inside our system of beliefs, in the practices of inquiry, or deny that it names any deep property at all.
The correspondence theory ties truth to fact; the coherence theory ties it to fit within a consistent whole; the pragmatist ties it to what inquiry would settle on and what works in practice; the deflationist holds that "is true" adds nothing beyond re-asserting the claim. These are rival accounts of the same thing — what truth is — not different topics.