Well curious human normally we don't give information to outsiders but since you will soon be joining this world I guess I'll have to tell you.
let's start with basic tribe code
1.never neglect a kit in pain or danger even if from another tribe
2.Do not waste prey
3. Do not kill unless absolutely necessary to win a battle
4.loyalty belongs to the tribe above all else
5.Do not eat before kit-mothers elder cats or the injured
6.Obey your leader unless they are corrupt then there second in command may take over and drive them out

Now for the Tribes them selves we have the tribe of moon lit night, the tribe of sun filled sky, the tribe of plant covered ground, and tribe of sky touching stones.

The cats of the moon lit night tribe are smaller than other cats but don't be fooled these cats are smarter than you think they are also the only tribe that can swim and fish. They're masters at slinking in the undergrowth and shadow but As cunning and unfriendly as they may seem to a stranger if you gain the loyalty of one of these moon cats you will never lose it.

The cats of the tribe of sun filled sky are fast and energetic. There wolves are also the most friendly they can be a bit overly trusting sometimes and rash sometimes. They also love laying in the sunlight and hate rain and snow. They may seem to jump to conclusions a bit to often but a sun Cat will never hesitate to defend what they believe is right.

The tribe of plant covered ground are kind and caring. They can climb through the trees and have the most knowledge of healing herbs. These cats can be a bit overly generous or a bit slow to fight but a cat of the plants will never stand for injustice.

The tribe of sky touching stone are strong and tough cats. They may be physically stronger than the other tribes and can take a hit better they don't place much value on intelligence. These sky reaching cats may be scattered brained but they often have a heart of gold.

Well I bet you want to know about how the tribes work
The power mainly lies with these three cats the leader,the second,and the healer. The leader is obviously the first in command who makes kits into learners and learners into full fledged Tribe members they appoint the second in command and shares the duty of  making patrols with the second. The second has the ability to exile the leader if they are corrupt or harmful to the pack(if the healer agrees)they share the duty of organizing patrols with the leader and will become the leader of the leader dies with out naming one of there kits heir. The healer is the tribes main medic and often the tribes smartest cat in the tribe they assist the leader and second in most major decisions along with being able to work with the second to get rid of an unjust leader but keeping there eyes out for learners with healer potential who they make into a healer apprentice(more on that later). Once a Cat is to old for hard labor they become an elder. Elders are cats who have served the tribe and are valued for their knowledge and often times like to help care for the kits. The kits are cats to young to become a learner and are allowed to safely play there days away.
As soon as a kit is old enough they become a learner which is a position between kits and one of the adult ranks you learn bits of skill from all members of the Tribe and the leader will decide where you belong. There are also three sub types of learner that lucky few kits be come the heir a kit the leader that they have deemed there replacement when they die or retire who get lessons on tribe politics in addition to normal learner training. Kit's in waiting littermates to the heir who receive minor training and politics and have a chance replacing the heir if they die before becoming leader. Then of course the healer apprentice a learner that caught the healers eye that might go on to replace them they have a similar experience to a normal learner but focus a lot more on herbs and healing.
What's a learner to do after they've grown up and are ready to become full fledged members of the tribe well the leader puts ordinary learners into one of four categories. The first being Hunter a self explanatory life of hunting for the clan. The second is the constructor they gather materials repair dens and make defense mechanics to guard the camp. The third warriors they patrol the territory and do the majority of fighting. The fourth and final class is scout they explore new lands and do spy work for there Pack.
She She-cats may temporarily be sorted to the class of kit-mother if they become pregnant or have kits to nurse where there goal is really be a good mother and keep your kittens alive.

Also credit where credit is do I got the idea of a winged cat rp from Musicdevil but I put a massive spin on it from her original idea.