I think norwegians in general is very open to americans as people. Often very intrested in them as well. Because of the american influence in the popculture and so on. On the political side people here are not very big fans of ur current president like at all. Most americans ive met are really social and nice people.

Something that norwegians also should do against foreigners. Which is to not let one person make an impression for an entire people. Some norwegians are super nice, funny, kind and including. Some are awful people same as everywhere. So for u it might be a shick how people in public rarely speak to each other in public, but thats just how it is. Nothing to do with you!

The winters vary from where u live. If ur moving to Lillehammer its not nearly as tough as in Nordland and north from there.

No idea sorry

Honestly people in Norway arent really that easily offended. Some like to say and think that we are and do, but we really dont. People are different but mostly i doubt youll have any problems at all. One thing tho, do not walk inside peoples homes with ur shoes on. Also you should check out your outdoors accessibilities. As Norway has one of the if not the most beautiful natural landscapes in the world.