First book: Harry Potter and the Philosopher's Stone (called the Sorcerer's Stone in the United States):
Harry Potter, an orphan living with his harsh aunt, uncle, and cousin, is introduced at the beginning of the novel. On his eleventh birthday, he finds out he is a wizard.
After being admitted to Hogwarts School of Witchcraft and Wizardry, Harry makes friends with Hermione Granger and Ron Weasley there.
Together, they solve the mystery of the Philosopher's Stone, an item that bestows immortality that Voldemort, the evil wizard, has hidden inside the school.
They save the stone from Voldemort and return it to safety with the aid of their friends and mentors, notably Albus Dumbledore, the headmaster of Hogwarts.
 

Harry Potter and the Chamber of Secrets, Book Two: 
A string of enigmatic attacks that start during Harry's second year at Hogwarts terrify students and fuel speculation that the Chamber of Secrets may be opened.
Harry learns that he is fluent in Parseltongue, the snake language connected to Hogwarts founder Salazar Slytherin. 
He finds the Chamber of Secrets' entrance and faces a younger form of Voldemort's soul that is kept inside a journal. 
Ginny Weasley, Ron's sister, was possessed by the black magic contained in the diary. Harry destroys the Basilisk and saves her with assistance from Hermione, Ron, and Professor Dumbledore.

Book 3: Harry Potter and the Azkaban Prisoner: 
When Harry returns to Hogwarts for his third year, he finds out that the infamous prisoner Sirius Black has broken free from the wizarding jail known as Azkaban. 
Harry learns that Sirius Black, who is thought to have betrayed Harry's parents to Voldemort, is his godfather. 
Over the course of the year, Harry and his pals come across the soul-sucking Dementors that protect Hogwarts and discover Harry's bond with them. 
By revealing Sirius Black's innocence and his relationship to Harry's family, they stop his unjust execution and expose Peter Pettigrew, the real traitor.

Book 4: Harry Potter and the Goblet of Fire
The Triwizard Tournament, a magical battle between three wizarding schools, is held at Hogwarts. Unexpectedly, Harry, who is underage, emerges as the fourth champion. 
Throughout the competition, Harry must navigate tricky interpersonal relationships in addition to risky challenges like coming into contact with mermaids and dragons. 
In the last job, Voldemort reclaims his full strength and dares Harry to a duel while transporting him to a graveyard. 
Harry manages to escape and makes his way back to Hogwarts, where he witnesses Voldemort's reappearance and the beginning of the Second Wizarding War with the aid of his friends and the ghost of Cedric Diggory.

Book 5: Order of the Phoenix: the Harry Potter series and 
As the Ministry of Magic propagandizes against Harry and Dumbledore and rejects Voldemort's reappearance, tensions within the wizarding community are rising as Harry returns to Hogwarts. 
Feeling alone and abandoned by the school's leadership, Harry creates Dumbledore's Army, a covert organization to teach pupils how to defend themselves against the evil arts. 
He discovers the prophecy about Voldemort and himself, which states that one cannot survive while the other does. 
The battle at the Department of Mysteries, when Harry and his companions combat Death Eaters and see a mistaken vision of Sirius Black's danger that ultimately results in his death, is the book's climactic event.