[Yora]

The Races descriptions are about the humanoid species, the Tribes descriptions about ethnic groups.
Monstrous races get into the Creatures category together with the other monsters, but also get a few additional stuff that would have been part of the Tribes descriptions.

For example religion would not be part in the description of elves but be dealt with seperately for each elven tribe. For goblins, that will just appear under culture in the Creatures category.