Questions about the original Harry Potter book

In Book Seven, Professor Dumbledore told Harry at King's Cross that Lily's charm existed in Voldemort and Harry, and that Harry's life would not end as long as Voldemort did not die. But Harry had killed Voldemort in the end, so the charm would not disappear until Harry died. What was going on with this talisman?
And why Voldemort had fallen when he had cast the Avada Kedavra Curse on Harry?
It didn't seem to involve Horcruxes....

Answer 1

The original novel of Harry Potter was a series of magical fantasy novels about Harry Potter's parents being killed by the evil wizard Voldemort. Harry Potter was adopted by Voldemort and was forced to live in Voldemort's magical world. As Harry Potter grew up, he constantly searched for the truth and fought against other wizards and wizards, eventually defeating Voldemort and restoring peace to the Wizarding world. The original Harry Potter novel had a wide readership around the world and had been adapted into movies, games, and other derivative works.