Regular table salt.
It is possible.
Yes, you can. Kosher salt is the same as table salt, only a larger granule.
Of course, both are sodium chloride.
Any serious difference exist between kosher salt and standard table salt.
All salt is kosher unless something is added to it that isn't kosher. Kosher salt is just a large grained salt. Use the same amount of any salt.
Yes. "Kosher" salt is really a misnomer. Coarse salt was used to cure and preserve certain meats, by drawing out residual blood, part of the process of "koshering" meat. So it came to be known as "kosher" salt, when if anything it should be called "koshering" salt. But because kosher salt is like lots of regular salt crystals stuck together, if the recipe calls for regular salt you need to use less kosher salt, but if the recipe calls for kosher salt you will most likely wind up needing more regular salt if you don't have kosher salt handy.
Yes, Margarita salt typically contains sodium, as it is a type of salt used to rim the glass of a Margarita cocktail. Margarita salt is usually made from real salt, such as kosher salt or sea salt, with added flavorings like lime or chili powder.
yes, but use a little less.
Yes
By default, all salt is kosher unless something is added to it to render it not kosher (usually flavourings). If you're just following a recipe that calls for coarse kosher salt, any coarse salt will do, or you could just use table salt.
Yes, both are sodium chloride.