Salt is the most basic of seasonings, but it can still be a bit of a mystery. What’s the difference between a box of Morton’s and a $30 jar of fleur de sel? How much is a three-fingered pinch? And what can be done when you add too much of it? We’ve rounded up our best advice on the subject – spotlights on different types of salt, tips on how to use it and store it, and a few recipes that put it in the spotlight.