how to rotate a object in unity using vector3 code example

Example: unity how to rotate something to point to something else

Vector3 dir = target.position - transform.position;
Quaternion lookRotation = Quaternion.LookRotation(dir);
Vector3 rotation = Quaternion.Lerp(partToRotate.rotation, lookRotation, Time.deltaTime * turnSpeed).eulerAngles;
partToRotate.rotation = Quaternion.Euler(0f, rotation.y, 0f);