Guide
Quests
Quests are given by named NPCs in settlements and camps. Press their portrait on the Location screen to talk to them.
A quest may ask you to fetch resources, kill a particular enemy, buy something from a market, or craft an item. The quest text tells you where to look.
Rewards are skill experience, Insight Points, caps and items. Some quests unlock features outright - the post office and the after-fight food selector are both quest rewards.
Quest items
Some quest items drop from enemies or resource nodes only while the quest is active.
A few of these are progressive: the more you look, the better your chances, until it finally turns up. If a drop looks impossible, keep going.
You must be at the right NPC to hand a quest in.