Each page here answers one question: where does this item drop, and at what chance? An item gets a page when it drops from more than one source and either from three or more, or a quest or recipe wants it. Sources are ranked by the drop chance recorded in Forever at ten or more loots, else by the vanilla 1.12 chance, labelled as such. A single-source item is covered by its own item page. Farming for money rather than one item? See Gold Farming, the mobs worth the most per kill at each level.
Sources: distinct NPCs and objects the item has been seen to drop from. Quests and Recipes: how many ask for it. Hover a name for the item; the link opens its farming page.