Wood

Wood!
Logs, easy to find. Most likely at spawn

When you break log with an (Ham)Axe, it will turn into wood

Info!

 * Break the bottom of the tree, It breaks the whole thing for you . ..
 * you can make back walls
 * You can make wooden hammers
 * You can use wood to make NPC houses
 * You can craft items like: Torches, Workbenchs, Back walls