X/ Crisis, I can count at least a few off my head:
1- Future Trunks timeline (The original Z warriors die):
DragonBall>Bardock: the father of Goku> DBZ Manga Canon (until end of Frieza saga)> History of Trunks
This is also the timeline Bardock was caught in Frieza's blast destroying planet Vegeta and sent into the past of the next timeline listed (below). It is unclear whether Frieza destroys planet Vegeta under the instruction of Beerus in this timeline.
2- Current Timeline/ Official Timeline (the timeline Future Trunks saved):
Dragonball>Manga chapter of Gine> Episode of Bardock> DBZ Manga Canon> Hey Son Goku + friends special/ Battle of Gods> Resurrection F> DB Super
This is the timeline where Bardock awoke in the past on Planet Plant, defeated Chilled and became the Legendary SSJ which started the rumours within Frieza's family about the legend of the Super Saiyan.
Since Beerus is this timeline's God of Destruction, and he asked Frieza to destroy planet Vegeta in this timeline, it is there arguable this only happens in this timeline as others could potentially contain other Gods of Destruction.
3- Cell of timeline 2's original timeline:
Dragon Ball> DBZ Manga (up to the Conclusion of the Frieza Saga)> Android saga occurs, 17/18 deactivated by switch created by Bulma from an alternate future Trunks (timeline unknown)> Super Android 13
Cell no longer exists in this timeline due to stealing Trunks' time machine and heading into an alternate past i.e. the main timeline (no 2). Trunks deactivates androids 17 and 18 with a switch created by Bulma. (As originally intended in timelines 1 & 2)
This is why in the movie Super Android 13, Trunks is stuck in the past and never leaves, there is no more time machine. Android 13 was another control put into place by Dr Gero, as well as Cell.
4- Anime Canon Timeline
Dragon Ball> Dead Zone > DBZ Anime canon until end of Frieza saga> Garlic Junior Saga> Cooler's Revenge> Return of Cooler> Cell Saga> Bojack unbound> Buu Saga> Wrath of the Dragon> DBGT> GT movie
Self explanatory, this is anime canon, not manga Canon. Cooler is in GT which supports this theory. The manga canon contains no visual indication of hell which is explored in the anime.
5- Spirit Bomb Timeline
Dragon Ball> *The World's Strongest> Tree of Might> Lord Slug
SSJ as we know it with Gold hair and green eyes doesn't exist in this timeline according to the movie Lord Slug.
Notice in every movie, Goku's most powerful finishing technique is always the spirit bomb.
In this timeline, Raditz was defeated and never got to call Vegeta/ Nappa to come to Earth.
*Note that in The World's Strongest, Goku still uses the 'power pole' from Dragon Ball.
6- Broly timeline (which could potentially fit into other timelines, particularly timeline 3)
Dragon Ball> DBZ Manga ------->Broly - The Legendary Super Saiyan> Broly - Second Coming > Bio Broly
In this timeline, Cell is either defeated in form 2 - never absorbs Android 17/18 - or simply never fought because he resides in timeline 2. Gohan never turns SSJ2.
After Broly - The Legendary Super Saiyan, Goku dies at some point. Perhaps due to the heart virus or for reasons unknown.
7- Fusion Reborn timeline
Dragon Ball> DBZ Manga with alternate events; Fat Majin Buu and Babidi die by SSJ 3 Goku
In this timeline, Majin Buu's defeat was different, since Vegeta was never resurrected after self destructing, fat Majin Buu was most likely defeated by SSJ3 Goku, who in the current timeline states he could have defeated him but wanted the other Z warriors to have their chance. This could also explain why there is no Ultimate Gohan and why Goku didn't just instant transmission him to fight Janemba. (Gohan was not his Ultimate form when killing Frieza.) UG was not yet invented by Toriyama at this time. Because of this, GT could also take place after this timeline.
If anyone replies please don't post spoilers of Resurrection F, haven't seen it yet.