Chop trees for logs, grind logs into planks, then sell planks for cash. Upgrade rarity to see higher-tier trees and unlock new forests to change what spawns.
Click the tree (or Space) to chop. Fell it fully to trigger its log bonus.
Convert piles of logs into planks with the sawmill. Better mills squeeze extra boards out.
Ship planks to buyers for money. Contracts and demand push the price per plank up.