Places

Except for people living in the most remote areas, the following is common knowledge among the population:

Countries & City-States
Badlands - Dangerous lands inhabited with orcs, goblins, and monsters

Rak-Sharad - Largest orc “city”

Fiebhart - human settlement. Frequent target of orc raids. A proud and hardy people. Lots of half-orcs.

Koden Kal, the Clockwork City. Cosmopolitan population, very wealthy. Lots of schools and research.

Toive - Vassal state of Kodan Kal. Started as refuge for Halflings. Known for Tequila, Glassworks, and Hanging Garden

Draconia - Land of the Dragonborn.

Elderstar - a human kingdom that has seen better days.

Erulastiel - a vast and ancient forest. Elven territory.

Velethuil Inaroris - Elven capital

Aramore - known for its colosseum. Destroyed following a slave revolt.

Eldridge - Big trading town.

Forcher Harbour - if you need something, you can find it here.

Senkan Plains - domain of the centaur chieftains. Nomadic tribes of centaurs  and halflings control this area. They do not allow the construction of permanent towns or buildings in their domain.

Akla - “capital” of the centaur nation. When all the tribes are called to gather, a great tent city is constructed there.

Spine of Ragnos - vast mountain range filled with perils. Dwarves live under the mountains; only they know what is farther west.

Sorrow’s End - mythical city

Slavery
There is institutionalized slavery in most societies, though the specific nature of the relationship often varies.

The lightest and most common form of this is serfdom. Serfs who occupied a plot of land were required to work for the lord of the manor who owned that land, and in return were entitled to protection, justice and the right to exploit certain fields within the manor to maintain their own subsistence. Serfs were often required not only to work on the lord's fields, but also his mines, forests and roads.

There is also indentured servitude, where people will voluntarily sell themselves to an employer for a set number of years. For example, a farmer might sell himself to a lord for a year to pay off their debt or to buy land. One might find themselves in a spiral of servitude if they accrue more debt than they can pay off.

It is common to fall into slavery permanently by being captured in battle or being on the losing side in a war. Parents can sell their children into slavery as well; this is most often done to children who will become eunuchs. It is disgraceful (though perfectly legal) to sell your children.

Most slaves are born into it - typically halflings and tieflings.

In the Senkan Plains, each centaur will typically have at least one halfling squire serving their needs. This is a symbiotic relationship.