Simmering the bones in water with some vinegar helps release nutrients from the marrow within the bones, as well as break down other tissues into the water. The result is a flavorful, nutritious broth.
Also, brewing connective tissue into bone broth provides the body with natural compounds from the cartilage. Tissues and bones also contain collagen. Cooking collagen turns it to gelatin, which provides the body with amino acids, which are the building blocks of proteins.
Your reasons for making bone broth will likely determine how you serve it. For restorative and medicinal purposes, it is hugely popular to sip a cup of warm bone broth with a sprinkle of sea salt and cracked pepper.