Tame a Dung Beetle
Put the Dung Beetle in a closed pen or secure area
Enable wandering on the Dung Beetle
Feed it feces from your inventory or from nearby creatures
Use larger feces for faster fertilizer production
Keep the Dung Beetle loaded in an active area
Place a nearby storage container for easy fertilizer collection
Check the Dung Beetle inventory for fertilizer and oil
Repeat feeding with more feces as needed