A few words about "salt." A lot of chemical compounds are salts, so what we are talking about here is Sodium Chloride. Most of the world, I believe, get their salt from mines. But at the south end of the San Francisco peninsula salt is produced from sea water. Thus having lived in Northern California for decades I think the only salt I have ever known is sea salt. There is no dietary advantage of sea salt vs. mined salt
What I think is the troublesome part is the Sodium in "salt." Light salt is a different "salt" - Potassium Chloride - and thus has no sodium. So to avoid sodium just buy potassium chloride (i.e. light salt).