Ron wasn't unintelligent to begin with, he simply wasn't the best in school. He preferred socializing and sports over studying and didn't go out of his way to learn like Hermione did.
In my opinion, his low self esteem hindered his education the most. He was the second youngest of seven, he didn't see the point in trying to be the 'best' at anything because one of his brothers would have done it first. So, he just didn't apply himself more than he had to, especially to things he didn't like (like school work).
I know plenty of people, myself among them, that are smart but poor students. Ron still managed to be a strategist, a rebel, and a great friend, for all he didn't read.
Hermione Granger-Viktor Krum
Ronald Weasley-No Opinion
Harry Potter-Cedric Diggory
Neville Longbottom-Hannah Abbot
Luna Lovegood-Ginny Weasley
Draco Malfoy-No Opinion
Goblet of Fire! Though Prisoner of Azkaban is a close second. Action, intrigue, Sirius Black, Remus Lupin, Cedric Diggory, all the best stuff! Plus, that's were the plot really starts to pick up.
In the books, it does contain a very small amount of alcohol (though only beings with very weak tolerance are affected, such as house elves). At, say, Harry Potter word, it's basically heated cola.
Notebook. While I wouldn't mind using parchment for the final drafts, it's very expensive and the rolls are unwieldy. Same reason I'd still use pencils rather than quills for most work.
Snape was the worst! Terrible! Awful! He was selfish, rude, bitter, hateful, and just mean. Nothing excuses a thirty year old man bulling children. Nothing! No backstory, no 'love', no old feuds with dead school mates. He knew exactly who he was hanging out with in school, and it's his fault the Potters were targeted in the first place. Because he heard the part of the prophecy the said a child was being born that would rival the Dark Lord and he rushed to tell Voldemort to kill a baby. Even later, he made it clear he didn't care if /the innocent baby/ was killed (or James for that matter). He was a bad person!
To be a pureblood, your parents and grand parents all have to be magical. So, Harry is a half blood because Lily's parents are muggle, but Harry's kids are purebloods. The farther back a family tree goes without a muggle or ill-concealed squib or blood traitor, the more influential and respected the family is, which is where the Sacred Twenty Eight come from and why it didn't include the Potters.
Yes! And I think my favorite (non-angst) head canon is.... probably that Remus was a music junky and got Sirius into all sorts of Muggle bands, like ABBA and the Ramones and David Bowie like Dancing Queen came out just two months before Sirius' birthday, and Remus, Peter, and James all trolled him with it until the song got banned.
I deeply dislike Snape, but I mostly get mad that people keep marking excuses for him. He, a man in his thirties, verbally abused children, and so many act like that doesn't matter. He may not have been 'evil' at the end, but he wasn't a good person. If you heard about a teacher in real life who tried to make a student poison their own pet, no one would defend that behavior.
Grindelwald. He was farther reaching, was actually master of the Elder Wand for a time, and was sane enough to actually plot. If it weren't for Arianna's death, he'd probably have even had Dumbledore on his side.
It's possible that the spell wasn't as strong because there were simply so many people, or the part of Harry that 'died' was so small, or they weren't blood relatives.
I don't think that Ginny gave Harry a love potion at all. She clearly respected that he didn't like her back and she tried dating other people. She clearly /enjoyed/ dating, too. She was also smart enough to know that a love potion would be a temporary and ultimately painful 'solution'. She wanted Harry to like her for HER, not to be the girlfriend of the Chosen One like Romilda wanted.
Anti-Muggle(born) ideals used to be about protection, but in the time since witch hunting, they turned into a sense of superiority. At the time they separated from Muggle Society, wizards had better education, medicine, transportation. As burnings became less of a threat, they stayed separated not only to try to keep themselves secret and safe, but because most of them genuinely didn't think that the Muggles had anything to offer them. That's why they still use quills, parchment rolls, and robes. They think they've reached the top and refuse to change. That's also why the 'purest' families tend to also be the most old fashioned.
Because Ginny is a nice person? And wanted to help?
Hogwarts would have been founded during a period of heavy Christianity. It's possible that they adopted these customs to help blend in to muggle society.
That said, the roots of Christmas go far beyond religions and the Hogwarts celebration doesn't seem to have any religious aspect at all. From what we see, it just seems to be a reason to decorate and overindulge in some food. Who doesn't love a good party?
The movies have several continuity errors to try and make it more visually interesting.
No problem!
When Harry was struck by the killing curse it didn't damage his body, so I think it's safe to assume that the Dementors Kiss would have done the job as well. Though slower and more painfully and maybe a bit too affectively.
It only works if you continue to drink it. That's why he attacked at least two unicorns during Harry's first year.
Your patronus and your animagus form are almost always the same as they have the same criteria (the animal form that best represents your personality).