Quiz: You're Not a True Potterhead If You Fail This Hogwarts Quiz

Hufflepuffs are known to be patient and loyal and "unafraid of toil," according to the Sorting Hat. Cedric Diggory is a Hufflepuff who's selected for the Triwizard Tournament — along with Harry.

Harry learns that Hagrid was expelled for unleashing the monster from the Chamber of Secrets, supposedly his pet "spider," Aragog. In reality, Hagrid was innocent and Tom Riddle was the guilty party.

Both of Hermione's parents are Muggles and dentists. They're supportive of Hermione when she learns she's a witch and accepted at Hogwarts. Still, Hermione faces some prejudice for her Muggle background.

During the final battle, Bellatrix Lestrange almost hits Ginny Weasley with the Killing Curse. Seeing this attack on her daughter, Molly goes into a rage and kills Bellatrix, to everyone's surprise.

These three characters, along with Peter Pettigrew and James Potter, are Animagi — witches and wizards who can transform into an animal. Rita, for instance, turns into a beetle to spy on people for her stories.

Fred and George are twins in the Weasley family and by far the greatest troublemakers. The pranksters eventually drop out of Hogwarts and open a successful joke shop on Diagon Alley.

For all of Harry's fourth year at Hogwarts, he thinks Professor "Mad-Eye" Moody is an eccentric but brilliant Defense Against the Dark Arts teacher. Turns out he's a dastardly Death Eater in disguise!

Polyjuice Potion is a complicated potion that allows the drinker to take on the appearance of someone else. For the potion to work, it needs a small piece of that person, such as a hair. Yum!

In "The Order of the Phoenix," Harry meets Hagrid's half-brother, Grawp. Hagrid, who's half wizard and half giant, keeps Grawp hidden in the Forbidden Forest until he can teach him English — and how to behave!

Albus Dumbledore, son of Percival and Kendra, had a brother, Aberforth, and a sister, Ariana, growing up. Sadly, she was inadvertently killed when Albus and Aberforth fought Grindelwald in a duel.

Hogwarts students first take O.W.L.s, or Ordinary Wizarding Level exams, in their fifth year. They can then study for their N.E.W.T.s, which help determine which jobs they can apply for as graduates.

Harry Potter hears mysterious voices that no one else can hear — and for a simple reason. Harry's a Parselmouth, which means he can speak to snakes, including the fearsome basilisk!

Buckbeak is one of Hagrid's animals. Draco Malfoy provokes the hippogriff into attacking him, which leads to the creature's execution sentence. Harry and Hermione use time travel to save him, though.

At the beginning of "The Sorcerer's Stone," Hagrid delivers baby Harry to Dumbledore via his flying motorcycle, and Dumbledore leaves Harry with his relatives. Years later, Harry dreams of this event.

Snape is a skilled Occlumens, which means he can block his mind from people trying to penetrate it. He's also a Legilimens, having the ability to sift through another person's thoughts, like a mind-reader.

Creating a Horcrux is a form of dark magic in which the witch or wizard places part of their soul in an object, thereby making themselves immortal. Tom Riddle learned about them from Professor Slughorn.

Nagini is more than just a pet snake; she's one of Voldemort's Horcruxes, which is why he guards her so protectively. But at the final battle at Hogwarts, Neville successfully kills the snake.

The delightfully loopy Luna is a Ravenclaw. Students in Ravenclaw House are known for being wise and keen to learn. Although Luna appears eccentric, she usually knows exactly what's going on.

Peeves is a poltergeist who delights himself by causing mischief at Hogwarts. When Umbridge begins her tyrannical reign at the school, Peeves makes it his mission to prank her relentlessly until she leaves.

Lily Potter died trying to protect her son from Voldemort. Her sacrifice caused Voldemort's Killing Curse to rebound and hit him, almost destroying him. As Dumbledore explained, love is the most powerful force.

At Ollivander's, Harry tries out dozens of wands before finding the right one: an 11-inch holly wand with a phoenix feather core. Harry later discovers that Dumbledore's phoenix Fawkes provided the feather.

A Boggart takes the form of whatever frightens a person the most. In Neville's case, that's Professor Snape. So to defeat the Boggart, Neville imagines Snape wearing his grandmother's clothes!

A Patronus is a protective force against Dementors. Each person's Patronus takes a particular animal shape. In Ron's case, the Patronus looks like a Jack Russell terrier — appropriate for a loyal friend.

Ron is pleased to have a girlfriend at first, but Lavender soon starts to get under his skin with her cloying behavior and possessiveness. In particular, he can't stand her nickname for him, Won-Won.

Salazar Slytherin was one of the four founders of Hogwarts. Unlike the others, he felt Muggle-born wizards shouldn't be accepted. He also created the Chamber of Secrets before leaving the school in anger.

Sybill Trelawney is the Divination professor, although her ability to foretell the future is dubious at best. Dumbledore hired her after she made a prophecy about the Dark Lord Voldemort.

Potions professor Snape has long coveted the position of Defense Against the Dark Arts professor, and in Harry's sixth year, he finally gets it. Even as a child, Snape was gifted at creating spells.

Dobby is the property of the Malfoys, but Harry devises a way to set Dobby free. He tricks Lucius Malfoy into tossing one of his socks to Dobby, which sets the elf free from his bondage.

Although Harry asks out his crush Cho Chang, she goes to the Yule Ball with Cedric Diggory instead. Harry and Ron eventually line up dates with the Patil twins, Parvati and Padma.

Oliver Wood is the Keeper and the captain of the Quidditch team when Harry joins in his first year. Oliver is known for being fanatical about the game and is thrilled to win the Quidditch Cup in his seventh year.

At 16, Draco Malfoy becomes a Death Eater, like his parents Lucius and Narcissa. However, he seems reluctant and fearful to carry out his job of killing Dumbledore. Snape fulfills the task for him.

Tonks is an Auror and a member of the Order of the Phoenix with a unique ability: She's a Metamorphmagus. That is, she was born with the ability to change her appearance without using spells or potions.

Remus Lupin and Tonks get married and soon afterward have a son named Teddy. However, Lupin and Tonks both tragically die in the Battle of Hogwarts, leaving their young son an orphan.

Harry Potter's middle name is James, after his father. James Potter was also a Gryffindor at Hogwarts, along with his friends Sirius Black, Remus Lupin and Peter Pettigrew. James died at age 21.

Bertie Bott's Every Flavour Beans look like jelly beans and come in a wide variety of flavors, including some disgusting ones. The fun of eating these candies is that you never know what you'll get!