User:Wonderwallthisis

This comes from Quora.
 * The Fidelius Charm: Harry's parents were murdered by Lord Voldemort because he was able to find their hiding place after their Secret Keeper Peter Pettigrew betrayed their location and broke the Fidelius Charm. In "Harry Potter and the Deathly Hallows," Bill Weasley and Arthur Weasley became their own Secret Keepers: Bill for Shell Cottage where he lives with his wife Fleur and Arthur for Aunt Muriel's home. Since the most fool-proof form of protection would be if the Secret Keeper stayed in the protected home, why couldn't James or Lily have performed the charm themselves?
 * Cost of Wands - The best example is how a unicorn hair costs 10 galleons while a wand from Ollivander - some of which contain unicorn hair and other expensive cores like dragon heartstring and phoenix feathers - will only cost you seven galleons. Assuming he doesn't cut the hair while making the wand, Ollivander is selling his wands at a loss of at least three galleons.
 * Pre-Hogwarts education - Harry, Hermione, and the other Muggle-raised witches and wizards are all taught at least basic math and reading skills before attending Hogwarts. But once they get to Hogwarts, their Muggle education is done and they focus on magical classes like Transfiguration, Arithmancy, Charms, and others. During the seven years the students spend at Hogwarts, they are never taught advanced math, literature, music, health, or any foreign languages. As far as we can tell, students from magical families don't go to any school at all until they're 11 years old and receive their letter from Hogwarts.
 * Peter Pettigrew on the Marauders Map - In the "Prisoner of Azkaban," Harry is given a magical map known as the Maruader's Map by Fred and George Weasley which shows the location of every person at Hogwarts as well as their real name, even if they're disguised or hidden. They tell Harry they studied the map thoroughly during their time at Hogwarts and owe much of their mischievous success to. Neither Harry, Fred, or George ever realize there is another name sleeping in Ron and Harry's dormitory every night - Peter Pettigrew, who went into hiding as a pet rat with the Weasley family for 12 years after helping to murder Lily and James Potter. It's possible Fred and George stopped looking at the map before Ron started school, but since Scabbers is "Percy's old rat" Ron inherited, it implies that Percy had Scabbers for his first few years at Hogwarts. It would be remarkably convenient if Fred and George never checked on their older brother while causing mischief or looking over their secret map at night where they would have seen Pettigrew's name.
 * Triwizard Tournament - The Triwizard Tournament was held during "Harry Potter and the Goblet of Fire" as a way to bring together the schools of Hogwarts, Beauxbatons, and Durmstrang. There were three challenges for the champions to get through, which were meant to be thrilling. But when the spectators came to watch and enjoy the tournament, only one out of the three events was actually worth watching. The first challenge was an exciting fight against a dragon, but the second task took place at the bottom of a lake and the third task was in a secretive maze. The audience must have simply stared at the lake or maze for an hour, waiting for something to happen. You'd think for magical wizards they could have come up with some way for spectators to watch and enjoy the tournament.
 * Veritaserum - A powerful potion that can force the drinker to tell the truth. Though the potion's use is strictly controlled, it's confusing why there can't be exceptions made during a wizard trial. I could see wizards outlawing the forcible use of Vertiserum on a suspect, but if a witch or wizard requests their testimony to be taken with the use of the potion - like a Muggle lie detector test - it's unclear why Veritaserum couldn't be used to provide evidence and save innocent lives.
 * Goblet of Fire Portkey - The function of portkeys in the books is a bit muddled. When we're first introduced to portkeys in the Harry Potter series it's at the start of "Harry Potter and the Goblet of Fire" when our heroes go to the World Quidditch Match. They have to be on the hill at an exact time in order to "catch" the portkey. Then in the fifth book "Harry Potter and the Order of the Phoenix," Dumbledore quickly makes a portkey to transport Harry and the Weasley children to Number 12 Grimauld Place. Again, there is a countdown before they are transported and for all we know, the object that became the portkey becomes unmagical again. But in "Harry Potter and the Goblet of Fire," Harry and Cedric Diggory grab the Triwizard cup during the Triwizard Tournament, which responds at their touch to take them to the graveyard where Lord Voldemort is waiting. That's bizarre enough, but what's truly unprecedented is that Harry is able to reuse the portkey to return to Hogwarts, again at his slightest touch. Instead of dropping him back in the middle of the maze where he grabbed the cup, the portkey drops Harry in front of the crowd watching the Triwizard Tournament. Since Rowling has never addressed this in the books, our best guess is that Voldemort wanted a tool which could somehow get him inside Hogwarts after he had returned to power. By touching the tampered portkey, perhaps he hoped he could then enter Hogwarts without needing to apparate inside (since you can't) or walk through the front gates.
 * The trace - the "Trace" makes little sense in the "Harry Potter" world. According to Mad Eye Moody in "Harry Potter and the Deathly Hallows," the Trace is described as a spell that "detects magical activity around under-seventeens." Dumbledore also tells Harry in "Harry Potter and the Half Blood Prince" that while the trace detects magic, it can't detect who performed it, so the Ministry relies on wizard parents to "enforce their offspring's obedience while within their walls." This means if any magic is performed around underage witches or wizards that's not at a known magical home or location, that underage wizard could get in trouble. But apart from Harry's Patronus, Dobby's Hover Charm, and an incident where Harry "blows up" his aunt, all the other magic performed around Harry at Privet Drive is ignored. Nymphadora Tonks' series of charms like "Scourgify" and "Locomotor Trunk" in "Harry Potter and the Order of the Phoenix" are used without incident and Mad Eye Moody performs a Disillusionment Charm on Harry in the same chapter. One book later, Dumbledore conjures a magical chair in the Dursleys' living room and offers them magical floating cups of mead in "Harry Potter and the Halfblood Prince." Those are just a few of the instances of magic around Harry at Privet Drive where he should have been reprimanded by the Ministry if the Trace worked properly. And let's not forget Lord Voldemort killed his Muggle father and relatives before he had come of age. Voldemort murdered them in a Muggle home and with the Trace still on him, and yet his uncle Morfin - an adult wizard - took the blame.
 * How did Sirius and Bellatrix get their wands back - When witches and wizards are sent to Azkaban, we learn their wands are taken away so they can't defend themselves against the Dementors who guard the prison. But how does everyone who escaped from Azkaban - from Sirius Black to Bellatrix Lestrange - eventually gets their wands back? Perhaps Bellatrix retrieved her original wand after the Dementors had joined Voldemort's army, but Sirius has a wand in "Harry Potter and the Order of the Phoenix" and it's never explained where he gets it. There are lots of possible explanations - it was a Black family heirloom wand or Ollivander secretly made him a new one - but none of these are explained in the book.
 * Multiple wand use - In "Harry Potter and the Deathly Hallows," Harry uses three wands at once to perform a triple Stupefy Charm which stuns the werewolf Fenrir Greyback to great effect: "The werewolf was lifted off his feet by the triple spell, flew up to the ceiling and then smashed to the ground." Harry never practiced the technique of using more than one wand at once and doesn't seem anymore drained by performing the spell than with one wand. So if using three wands will give you a "triple spell," why don't more wizards battle with multiple wands?
 * Food in the Deathly Hallows - One of the biggest struggles Ron, Hermione, and Harry face while searching for Horcruxes in "Harry Potter and the Deathly Hallows" is getting food. But as Hermione tells Ron, food is "one of the five exceptions of Gamp's Law of Elemental Transfiguration. You can summon it if you know where it is, you can transform it, you can increase the quantity if you've already got some." The thing is, the three heroes find a lot of food, either by stealing from a chicken coop or going into a grocery store. Why can't they simply increase the quantity of what they already have? They also hear Dean Thomas, Ted Tonks, Dirk Cresswell, Griphook, and Gornuk beside a river use the spell "Accio" to capture salmon from the river. The book says the "delicious smell of baking salmon wafted tantalizingly in their direction," yet Harry, Ron, and Hermione never try this neat trick out on their own.
 * Why didn’t Voldemort make the Death Eaters make an Unbreakabke vow - We're introduced to the Unbreakable Vow in "Harry Potter and the Half-Blood Prince" when Severus Snape makes the vow to Narcissa Malfoy that he will help her son Draco murder Albus Dumbledore. It's an integral moment in the books because as Ron explains, "you can't break an Unbreakable Vow." The magical spell involves one witch or wizard making an oath to the other and if those terms are broken, the oath breaker dies. So why didn't Lord Voldemort, described as one of the least-trusting wizards to ever live, make all of his Death Eaters swear their allegiance to him with an Unbreakable Vow? Surely he would want all of his servants to be obedient and never be able to turn on him without dying. It seems like the sort of demented and controlling thing Lord Voldemort would do.