Firstly, our culture isn't that English. It has some parts that are, but lots that aren't. So much of Harry Potter is imaginary, that it would be very difficult to know which of it is culturally relevant, and which is 'made up'. To me, that suggestion sounds a bit like suggesting listening to K-Pop songs to learn about Korean culture. Reading it might help your English reading, but even that might be problematic. There are lots of 'made-up' words, and many of those have very subtle language references that would be completely lost on a non-native reader. ( Pensieve for instance )

It strikes me as the world's least efficient way to learn about a culture. But it will certainly help your English.

KIwiland is full of wizards and such. We are just better at hiding from muggles than others. . Have to agree with Gary. Some aspects will work, a lot is just different. I think most of the aspects that will work for New Zealand culture are just those common to many Western cultures. . Pensieve, the example, is a made up word. Might be difficult to tell the real from the made up. :) . Will it teach you better about culture than going outside? I doubt it.

actually i didn’t read harry potter so i can not sure you but i think if you read it. it will be very helpful

i think yes