Harry Potter is a series of fantasy novels written by British author J. K. Rowling. The novels chronicle the lives of a young wizard, Harry Potter, and his friends Hermione Granger and Ron Weasley, all of whom are students at Hogwarts School of Witchcraft and Wizardry. The main story arc concerns Harry's struggle against Lord Voldemort, a dark wizard who intends to become immortal, overthrow the wizard governing body known as the Ministry of Magic, and subjugate all wizards and Muggles (non-magical people).
(According to Wiki: https://en.wikipedia.org/wiki/Harry_Potter)
1. Philosopher's Stone
Harry Potter has been living an ordinary life, constantly abused by his surly and cold aunt and uncle, Vernon and Petunia Dursley and bullied by their spoiled son Dudley since the death of his parents ten years prior. His life changes on the day of his eleventh birthday when he receives a letter of acceptance into a Hogwarts School of Witchcraft and Wizardry, delivered by a half-giant named Rubeus Hagrid after previous letters had been destroyed by Harry’s Uncle Vernon and his Aunt Petunia. Hagrid explains Harry's hidden past as the wizard son of James and Lily Potter, who were a wizard and witch respectively, and how they were murdered by the most evil and powerful dark wizard of all time, Lord Voldemort, which resulted in the one-year-old Harry being sent to live with his aunt and uncle. The strangest bit of the murder was how Voldemort was unable to kill him, but instead had his own powers removed and blasted away, sparking Harry's immense fame among the magical community
As classes begin at Hogwarts, Harry discovers his innate talent for flying on broomsticks despite no prior experience, and is recruited into his House's Quidditch (a competitive wizards' sport played in the air) team as a Seeker. He also comes to dislike the school's Potions master, Severus Snape, who is also the Head of Slytherin House who acts with bias in favour of members of his House while perpetually looking for opportunities to fail Harry and his friends.
A visit to Hagrid's cottage at the foot of the school leads the trio to find a newspaper report stating there had been an attempted robbery of a Gringotts vault—the same vault that Hagrid and Harry had visited when Harry was getting his school supplies. A further indiscretion from Hagrid allows them to work out that the object kept under that trapdoor is a Philosopher's Stone, which grants its user immortality as well as the ability to turn any metal into pure gold. Harry is also informed by a centaur named Firenze in the forest that a plot to steal the Stone is being orchestrated by none other than Voldemort himself, who schemes to use it to be restored back to his body and return to power. When the school's headmaster Albus Dumbledore is lured from Hogwarts under false pretences, Harry, Hermione and Ron fear that the theft is imminent and descend through the trapdoor themselves.
Quirinus Quirrell, the Defence Against the Dark Arts teacher, who had been the one working behind the scenes to kill Harry by first jinxing his broom and then letting a troll into the school. Snape had been trying to protect Harry instead, who had wronged him. Now, Quirrell is partly possessed by Voldemort, whose face has sprouted on the back of Quirrell's head but is constantly concealed by his oversized turban. Voldemort needs Harry's help to get past the final obstacle: the Mirror of Erised, forcing him to stand before the Mirror. It recognises Harry's lack of greed for the Stone and surreptitiously deposits it into his pocket. As Quirrell attempts to seize the stone and kill Harry, his flesh burns on contact with the boy's skin and breaks into blisters.
Harry's scar suddenly burns with pain, and he passes into unconsciousness. Three days later, he awakens in the school's infirmary, where Dumbledore explains his survival against Voldemort to be owed to his mother's sacrificing her life in order for him to live, leaving a powerful protective charm on Harry that lives in his blood, burning Quirrell, who was possessed by hatred and greed. He also reveals himself as the one who sent Harry his father's invisibility cloak, while Quirrell has been left to die by Voldemort and the Stone has now been destroyed
(Source; https://en.wikipedia.org/wiki/Harry_Potter_and_the_Philosopher%27s_Stone_(film))