Question: what are the three main categories of wood?
Answer: Softwoods. Softwoods aren't weaker than hardwoods. ... 
Pine. Commercial pines are grown in plantations for timber that is denser, more resinous, and therefore more durable than spruce. ... 
Cedar. The most common type of cedar is the western red variety. ... 
Fir. ... 
Hardwoods. ... 
Oak. ... 
Ash. ... 
Beech.