Fallout 76 quests

Quest system
In an interview with Geoff Keighley at E3, Todd Howard stated that the quests are akin to found-world quests. Per Jeff Gardiner, quests are largely received through holotapes, terminals and notes. Howard also stated in an IGN interview that robots are utilised to deliver the story of the quest and other traditional roles played by NPCs in past iterations.

Quests can be completed as a team, but each player character has their own quest items and objectives. Identical quest items may be scattered into different containers nearby.

Main quests
These quests are displayed under the section "MAIN" of the Pip-Boy. While these are listed in the sequence of occurrence, many can be started without having completed all quests prior to them.

Miscellaneous quests
These quests are displayed under "Miscellaneous" in the "MAIN" section of the Pip-Boy and start other main quests.

Side quests
These quests are displayed under the section "SIDE" of the Pip-Boy.

Secondary quests
These are non-affiliated secondary quests.

Miscellaneous quests
These quests are displayed under "Miscellaneous" in the "SIDE" section of the Pip-Boy and start other side quests.

Daily quests
These quests are displayed under the section "DAILY" of the Pip-Boy. They can be repeated every 24 hours. 

Miscellaneous quests
These quests are displayed under "Miscellaneous" in the "DAILY" section of the Pip-Boy and start other daily quests.

Event quests
These quests are displayed under the section "EVENT" of the Pip-Boy. Events are triggered by any player character approaching an event's location. Each event has a time limit to complete. Any player characters can participate by traveling to the location or refuse to by avoiding or leaving the area. These quests can be repeated every 1 hour and 12 minutes. 

Miscellaneous quests
These quests are displayed under "Miscellaneous" in the "EVENTS" section of the Pip-Boy and start other event quests.

Wild Appalachia
These quests were added as part of the Wild Appalachia add-on.