He would first need to learn the new rules. Every school has its own set of regulations, and in a different realm school, these rules could be very strange compared to what he's used to at Hogwarts.
He might meet new magical creatures. In a different realm school, there could be all sorts of unique beings that Harry has never seen before in Hogwarts. For example, some kind of flying serpents that can talk and teach ancient spells.
Perhaps Harry will meet some reclusive or mysterious figures in the new school. They could be ancient wizards who have been in hiding for years, or strange creatures that are able to communicate with humans. These encounters would surely add more excitement and mystery to Harry's time at the different school. He may also come across some students who have a different view on the wizarding war and Voldemort, which would make for interesting conversations and potential conflicts.
Well, he might make new friends who have different magical abilities or come from different backgrounds. Maybe he'll learn new spells or magical theories not taught at Hogwarts.
He might make a whole new set of friends. Different schools in the Harry Potter universe have their own unique cultures and student bodies. For example, if he went to Durmstrang, he'd be exposed to a more competitive and dark - arts - leaning environment. This could change his perspective on magic and his place in the wizarding world.
Maybe he'll make new friends who have very different magical abilities compared to his old schoolmates. For example, they might be experts in some rare forms of magic.
In fanfiction, if Harry goes to a different school, he may discover new magical creatures. Hogwarts has its own set of creatures like hippogriffs and thestrals. But another school could have ones that are completely unknown to him. This would expand his knowledge of the magical world. Also, the architecture and layout of the new school would be different. It might be built in a more modern style or in a completely different location, like underwater or on a floating island. All these changes would make for an exciting and different story.
Well, one difference could be the types of magic taught. American magic in fanfiction might focus more on native American magic traditions along with the regular spells. Also, the school layout would likely be different. Instead of the castle-like Hogwarts, it could be a more modern campus with different buildings for different subjects.
He would face the challenge of learning a new curriculum. Different schools may have different focuses in magic education. For instance, some might emphasize more on ancient spells while others on magical theory. Also, he might have trouble with the new social hierarchy. In Hogwarts, he is known for his deeds, but in a new school, he has to start from scratch and earn respect. There could also be differences in the use of magic wands or other magical tools that he needs to adapt to.