Hey Helgosam,
The homepage of the guardian site is more or less represented by the item endpoint '/'.
The reason for this is that the entire
guardian.co.uk site should be represented by the same path on the api as exists on the website (excluding some weirder bits of it).
Doing a normal query for that endpoint wont return you anything because the front page is a little bit special. For any normal navigation page, that would be just like a tag query, so /travel/france will show you anything that is tagged with the France tag.
But the front page is not a tag, so what you want is not the latest stuff from that item, but the editors picks for that item, which you can get by selecting the Show Editors Picks box at the bottom, or adding the show-editors-picks=true query parameter.
Hope that helps. I'll see if I can get a bit of time tomorrow to write up a few answers to the other questions that came through here.
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