That question was actually answered in the story. Whis said that if Beerus died, his duty as a guide angel would be suspended until there was a new God of Destruction.
Beerus inhabits the realm of living, so he would end in the other world.
Similarly to other Gods of Destruction and Supreme Kais, Beerus's life is linked to the East Supreme Kai, where if one dies then so will the other. This amounts to a weakness given East Supreme Kai's vast inferiority in strength to Beerus.
As a result of Future Shin's death at the hands of Goku Black (in the anime) or Future Babidi and Future Dabura (in the manga), Future Beerus was also killed, presumably while still asleep. His soul was destroyed when Future Zeno erased all Universes from the timeline (in the manga) or Universe 7 (in the anime).
Despite their immense power and longevity, Gods of Destruction are known to be capable of dying. Due to this, their Angel attendant will seek out and train potential replacements. The candidates do not have to be of a divine race as mortals are selected as candidates if they possess adequate power.
Although Broly is thought to be stronger than Beerus, it can't be denied that Beerus has extra powers up his sleeve, such as Hakai. Beerus' status as a God of Destruction ultimately gives him the edge over pretty much anyone — including Broly.
Although the crusade was a great naval success and Smyrna was taken, Zeno was killed by Umur Bey's forces in an ambush while he and the other crusader leaders, including Henry of Asti, were attempting to celebrate a mass in a church in the no-man's-land between the battle lines.
That time Goku almost killed Beerus.
Whether or not he cares about Goku personally, he was supposed to become his greatest rival, so he would be at least somewhat unnerved by his death.
Beerus seems to have a very long life span (in the millions of years) and doesn't seem to be near dying due to old age.
The more energy he exhausts the earlier he needs to go to sleep/hibernate. Weakness: Beerus is incredibly lazy. If Shin (Supreme Kai of 7th universe) is killed, Beerus will also die as well.
Given his role in the series, one would think that Shenron would be one of the most powerful beings in the universe. That's far from true, however, and he actually has some rather potent fears. One figure Shenron is visibly afraid of is Dragon Ball Super's Lord Beerus, who had an unexpected effect on him.
As we mentioned above, Beerus is known for his century-long naps. Before Dragon Ball Super, he was asleep for the entirety of Goku's life. After authorizing the destruction of Planet Vegeta, he went back to sleep for nearly four decades straight.
Because of the cruel reality and fate he received, he screams and powers up in extreme rage, and he vows to kill all the gods for destroying his home planet and ruining the chance of reviving them with the Dragon Balls. ULTRA Vegito commands Whis's staff.
However, Frieza's use for the Saiyans quickly waned, so with the approval of the Destroyer God, Lord Beerus, Frieza destroyed Planet Vegeta, killing King Vegeta and all of the other Saiyans who weren't on a mission off-world at the time.
Background. Monaka was initially described as being a hero of his home world planet, Wagashi. At some point in his past, he was said to have fought against the God of Destruction Beerus. He managed to cause Beerus trouble, which makes him later claim Monaka as the strongest fighter he's ever faced.
Probably not, despite the fact that he does enjoy Goku's company. This is a being that wipes out whole universes, along with everyone and everything within them, absolutely and completely out of existence with literally just the flick of his wrist, and with a smile on his face.
Zeno is a masculine name of Greek origin, meaning “gift of Zeus.” Formed from the name Zenon and the ancient derivative of Zeus, this timeless name holds powerful significance to those intrigued by Greek mythology.
Both Zeno and Future Zeno use the technique to erase Universes 9, 10, 2, 6, 4, 3, and 11 in the Tournament of Power, including all fighters and gods except Mohito, Kusu, Sour, Vados, Cognac, Camparri, and Marcarita.
Being trained by Beerus in the ways of Destruction Energy, Ultra Ego Vegeta would presumably be nearly equal to him. While Beerus likely still wins the fight, Vegeta is probably the closest mortal to actually being on similar ground with Beerus.
Whis is one of the strongest beings in existence, and interestingly enough, only his father and the Omni King are confirmed to be stronger than him.
Although Jiren is said to be able to defeat a God of Destruction, it's unlikely Beerus is at risk of suffering that defeat. Beerus has yet to use 100% of his powers in Dragon Ball Super thus far, whereas Jiren at 100% struggled against Mastered Ultra Instinct (MUI) Goku.