The Dark Lord — aka Voldemort — created seven Horcruxes in an attempt to sustain immortality. But, as you may have heard, Voldemort's plan ultimately failed. Harry Potter and co. found and destroyed all of his Horcruxes.
Yeah. There were 8 horcruxes. 7 were made by Voldemort intentionally ( Nagini, goblet, diary, locket, ring, diadem and the part of his soul in Voldemort himself) and 1 was made accidentally which was Harry.
Voldemort only ever intended to make six Horcrux, with the possibility that maybe he could create more in the future. However, when Voldemort attempted to kill baby Harry that fateful night, his killing curse backfired instead.
Dumbledore tells Harry that he suspects Voldemort has split his soul into seven pieces, and that no wizard has ever attempted multiple Horcruxes. The only way to kill Voldemort is to destroy all seven Horcruxes.
The Dark Lord — aka Voldemort — created seven Horcruxes in an attempt to sustain immortality.
Quirrell is, in effect, turned into a temporary Horcrux by Voldemort. He is greatly depleted by the physical strain of fighting the far stronger, evil soul inside him.
Each time a Horcrux was destroyed, Voldemort got weaker. The Golden Trio set about on a Horcrux hunt during Harry Potter and The Deathly Hallows, but they had already destroyed two by the time they embarked on their harrowing journey.
Voldemort was fixated on having his soul split into seven pieces, he assumed that it would provide him with additional protection. This is why he did not split his soul more by creating additional Horcruxes.
This is extracted from the wiki. So, when Voldemort died when tried to kill Harry, he commited murder, well. But noone was there to make the spell that take your splitted soul into a container. So Harry is just a weirs soul container, but not a Horcrux itself.
Horcrux: Quirinus Quirrell
This Hogwarts professor literally became a Horcrux when Voldemort decided to share his body. Quirrell was unable to resist Voldemort's will and was forced to do his evil deeds.
Voldemort intentionally made six Horcruxes, but when he used Avada Kedavra on Harry, he unintentionally created a seventh Horcrux. Instead of dying, Lily's love for Harry created a counter 'curse' known as Sacrificial Protection and saved Harry.
A Horcrux is considered destroyed when it's damaged beyond repair. In the case of living Horcruxes, “damaged beyond repair” would mean dead. So, yes, Avada Kedavra can destroy a Horcrux, as long as that Horcrux is a living being.
Nagini was Lord Voldemort's final Horcrux
In an interview, J.K. Rowling revealed that it was the murder of Bertha Jorkins that made Nagini a Horcrux. After Voldemort discovered his Horcruxes were in danger, Nagini was magically protected, described as being encased in a 'starry, translucent sphere'.
It's later revealed that Nagini was never an ordinary magical snake from start, as she was once in fact, a human (possibly a Witch) who became a snake as she is now as result of a blood curse and trapped in that form for the rest of her life.
J. K. Rowling stated in an interview that Regulus learned of Voldemort's Horcruxes because the Dark Lord indirectly let it slip, like he did in the Little Hangleton Graveyard. Subsequently, Regulus was intelligent enough to realise what it meant.
Voldemort thought Snape was the owner of the Elder Wand. Using Avada Kedavra while the Elder Wand was resisting Voldemort was already a risky business, but using it against the true owner would be suicide (as Voldemort would find out when he used the Elder Wand against its true owner: Harry).
This theory suggests that each time he created a new Horcrux, that specific Horcrux diminished a part of his soul. Thus, his nose began to sink in, eventually disappearing altogether. Due to his tampering with dark magic, his human appearance evolved into a more snake-like state.
Their ideologies did not line up. Voldemort was fixated on pureblood wizard/witch status. Grindelwald was focused on wizard/witch status in general. Grindelwald wanted to rule the muggles “for the greater good”.
Dumbledore knew that destroying Voldemort's horcruxes was the only way to truly defeat him. He believed that Harry was the one person who was smart, courageous, and perhaps lucky enough to find and eliminate all the horcruxes.
Hermione Granger and Ron Weasley destroy the Hufflepuff's cup Horcrux inside the Chamber of Secrets—Hermione giving it the fatal blow with a basilisk fang.
He finds out for sure immediately after Nagini's attack on Arthur Weasley. This night is significant in many ways. While Harry sleeps, he enters Nagini's mind.
Quirrell didn't use the Killing Curse on Harry, because Voldemort said “use the boy” to get the Sorcerer's stone from the Mirror of Erised. If Quirrell had killed Harry right away, he would have lost the chance to get the stone.
The villain in the "Fantastic Beasts" movies is Gellert Grindelwald, who played a small but crucial role in the "Harry Potter" series. He was the wizarding world's biggest villain before Voldemort came along. In his youth, Grindelwald was friends with Albus Dumbledore, who was in love with him.
No. Snape did not know Quirrell was hosting Lord Voldemort during the events of Book 1. He tried to stop Quirrell from acquiring the Sorcerer's Stone on Dumbledore's orders.