Yes, it is true.
No. If you live in the United States you do not need a Visa to visit Hawaii, or move to Hawaii. It is a part of the US. If you live in another country than yes, you would need a visa
If you are leaving the country you live in, yes.
Depends what country you live in
Yes, livning in a country doesn't make you a citizen. To live in a country legally you need to have the proper paper work.
It all depends on the country and location where you live.
Varies from country to country and year to year. If you need a more specific answer for goodness sake, spend an extra 10 seconds on providing a sensible question.
Yes, to fly anywhere that is outside of the country you live in you need a passport
That depends on which country you live in.
It would depend on what law/country you live in ...
It all depends on the country or location where you live.
It all depends on the country where you live.
Extra salt is not needed by your body, probably. You do not get the high blood pressure, when you do not eat the salt. In one tribal community, which was living in Central Africa and did not have access to slat, did not have high blood pressure. In tropical countries, you need to eat the extra salt. You loose the salt in your sweat, there.