Resources:
Wood
Wood is quite a valuable resource in Catan. It plays a vital role in the initial expansion of colonies. Wood is used in the building of roads and settlements
Brick
Brick is another important resource in Catan. Brick is an essential part in building roads and settlements, but there are less territories that have access to the clay than there are forests to harvest the wood also necessary.
Sheep
Sheep are also quite important in the initial phases of colonization. Sheep are necessary for establishing settlements and to maintain an army. The wool helps clothe and the meat helps feed the general population and the armies.
Wheat
Wheat, much like sheep are necessary for building settlements and maintaining armies. It is an important source of food for everyone, thus there are many wheat farms contributing to sustain the growth of each colony.
Metal
Metal is necessary for arming the militaries, building cities, and other general advancements in technology. Much like brick, metal is scarce, but important for the advancement of colonies in military prowess and resource extraction efficiency.