Warning: This post contain spoiler.
Maybe some of you have read Harry Potter and the Deathly Hallows already. Now, I just write my own oppinion about the novel, or generally, the series.
Harry Potter, is a boy-who-survived from Voldemort’s attack,while he is one year old (CMIIW). Voldemort, who have killed Harry’s parents, want to kill the young boy, and cast an Avada Kedavra spell. But Harry was survived, otherwise, Voldemort came to a state which almost dead.
When Harry’s age 11 years old, he entered Hogwarts, the School of Witchcraft and Wizardy. There he met new friends, Ron Weasley, Hermione Granger, Neville Longbottom, Hagrid, and much more. When at school, Harry also met his old “friend”, Voldemort, who have been chased him after he failed in killing him. But Harry always be the winner for the last 6 years.
In the end of 6th year in Hogwarts, Harry must face a painful fate. He lost his best teacher, best guide, and best friend, Albus Dumbledore. Dumbledore died after stroke by Snape’s Avada Kedavra. There’s many oppinions about the cause of Dumbledore’s death. But the fact is, Dumbledore have a chronic disease which reduce his life after destroyed one of the Voldemort’s Horcrux. Before he died, he told Harry to destroy the last six Horcruxes.
In the next year, Harry didn’t attend the school. He of to journey to search Voldemort’s Horcruxes, accompanied by Ron and Hermione. They have to face many danger in order to found the Horcrux. Like came inside the House of Malfoy, break the Gringotts defence, and many more.
When searching, they know one thing: There’s three things which can be owned by a witch, can make him/her “unkillable”. They’re the Magical Robe (the transparent robe), Resurrection Stone (well, guess from it’s name), and Elder Wand (the strongest wand). The Magical Robe believed belong to Harry, and the Elder Wand belong to Dumbledore. Since Dumbledore has died, the owner switched to Draco, whose wand used by Snape to “kill” Dumbledore.
Before the final battle, Harry realized that he’s the last Horcrux and he have to die in order to kill Voldemort. Then , the day has come. the final battle were held in Hogwarts. There, Harry duel Voldemort for the last time. In this duel, Harry use Draco’s wand, while Voldemort use the Elder Wand, sounds unfair isn’it? Harry told Voldemort that the wand he use actually belong to Harry. It’s all because Harry has defeated Malfoy in a duel at Malfoy’s house. Voldemort enraged, and cast an Avada Kedavra spell. But it have no effect for Harry. Harry still alive, otherwise the Voldemort’s soul inside him is destroyed. Voldemort have died. The Elder Wand fly and come to Harry, who used to be the real owner.
The last novel (for some fans) considered the best of Harry Potter series. But other say that the fourth is the best.
Updated: Thanks for goldfriend‘s information. Now I remember that Harry used Draco’s wand when dueling the Dark Lord. That’s the rule of the wizard duel. The loser give his/her wand to the winner.