Salt, pepper and garlic powder are staples in my cabinet. I season just about anything with that combo. On sandwiches you apply that right on the tomato and you can’t go wrong.
Salty is one of the seven basic flavors our tongue can detect, along with bitter, sour, astringent, sweet, pungent and umami. To achieve limitless sense of taste, our tongue is aided by our nose with it’s sense of smell. Don’t get too carried away with the salt though, I once had a bunch dump on some movie popcorn, which I decided to eat anyway, the next morning I woke up with my face all swollen up and extremely thirsty.