Triggers
Triggers are what runs the quests for players, and they can be tied to a block or entity, and be triggered on walk, right click, or left click. Triggers have also the option to cancel (or not) the action that triggered it, a right click for example. You can view all current triggers and TP/delete them by using /pbq triggers:
Event types are what kind of event the Trigger should listen to. They can be WALK, CLICK, RIGHT_CLICK, LEFT_CLICK or NPC. CLICK refers to both right and left clicks.
Triggers can cancel the original actions when running a quest. If cancel = true, the events that it listen to will be cancelled, and if cancel = false the events will NOT be cancelled, allowing posterior actions. When not specified in the /pbq addQuest command it defaults to true.
Entity triggers are triggers that run their associated quest when an entity is right clicked. To assign an trigger to an entity, run /pbq addQuest <quest line> <quest id> <event type> [<cancel action>] while looking to an entity, which will be your NPC. Entity triggers support only the NPC event type.
Block triggers are triggers that run their quest when a block is walked in, right or left clicked. To assign an trigger to an block, run /pbq addQuest <quest line> <quest id> <event type> [<cancel action>]. Block triggers support only the different CLICK event types.
PBQ can also spawn basic NPCs that you can assign quests to. Simply use /pbq spawn <type> while looking at a block to spawn an NPC on top of it. type should be the entity type of the NPC, like minecraft:villager.
You can also rename NPCs with /pbq rename <new name> while looking at the NPC.