The phoenix bird can carry extremely heavy loads of weight at once. And its tears have healing powers so it can fix any wound no matter how bad the wound is
What Does A Phoenix Bird Do?
They might be able to manipulate fire, possess super strength, heal wounds and it's cry can wrp reality.
A phoenix bird is the same as any other it just revive itself from it's own ashes
I would say what most other birds do. Eats, drinks, makes nests, lays eggs depending on if it is a female, flies, etc.