There are four Clans; DreamClan, WishClan, HopeClan, and GraceClan. Here's a bit about each clan.

DreamClan:

Territory: DreamClan is in a beautiful, lush forest. Making it have many places to hide and hunt efficiently. Also allowing many herbs to grow

Prey: common prey is squirrels, mice, and shrews. Along with voles once in a while.

Strengths: DreamClan cats are very quiet on their paws, mainly because of their hunting. They also are small to fit into small areas in the forest.

Flaws: They aren't good at adapting so easily, when seasons change and they lose prey they struggle to find solutions in time.

WishClan

Territory: WishClan is in a mountainy area, meaning their hunting ways are different.

Prey: birds are main prey along with occasional small animals

Strengths: cats are very strong because they have to do a lot of climbing. They also have good endurance.

Flaws: their herb storage is always low because of the lack of certain herbs. They also have a different knowledge of them from having a few different herbs.

HopeClan

Territory: HopeClan is on a open grassland. Allowing them to run fast throughout the open land.

Prey: rabbits, mice, voles

Strengths: cats are usually very fast, they are also good at fighting animals that wander into their open territory

Flaws: HopeClan doesn't have much shelter from the elements. Their camp doesn't have much surrounding their nests.

GraceClan:

Territory: an area with many rivers and streams leading to a lake.

Prey: all sorts of fish

Strengths: GraceClan cats are very elegant and strong swimmers. They are also good at hunting fish and finding the best spots to do do

Flaws: GraceClan isn't invaded very often. And most things wouldn't cross the rivers or lake to get to them. But when GraceClan is in battle, their fighting skills aren't that good as the others.

I didn't add much information about the clans, if you do want more you can ask questions about them and the territory in general!