A tiny bit of salt is actually pretty damn nice in coffee! And I mean a small sprinkle on an entire pot
Some people put butter in their coffee.
I’m not sure about salt, but my mom puts red wine in it. 0/10 not recommended.
A pinch of salt can lower the bitter taste of coffee, and is also good in dark cocoa. It also helps make grapefruit taste sweeter and If you are making veggie noodles (turnips make great veggie noodles) soaking the raw noodles in a little kosher salt/water can take the bitter flavor out so they taste more like pasta noodles when they are cooked.