[@Letter Bee] So what events are canon? 

- The good ending of Fallout 1

- Fallout  2 

- Fallout: Brotherhood of Steel

- Fallout: Tactics 

- Fallout 3 

- Fallout: Van Buren

- The defeat of Caesar's Legion in New Vegas

-  The DLC of Fallout 3

- The DLC of New Vegas

- Fallout 4