Salt, Fat, Acid, Heat — Mastering the Elements of Good Cooking is a highly rated cookbook and a limited Netflix series (4 episodes, 1 for each of Salt, Fat, Acid, & Heat) by Samin Nosrat.
But you don't need the book or the show to start making your food more delicious (most of my cookbooks are from America’s Test Kitchen/Cooks Illustrated). It's primarily a framework, so all you need to do is just check whether you've included each in whatever you're making. (I think "Texture" is missing, so I'll run a check for that too, and for whatever reason, I don't think as much about heat as a variable to switch up).
So let's say you were just going to have some rice. You might consider adding salt, but what about butter? or sour cream? what about squeezing some lime on it? 😋
Mashed potatoes? Salt, butter, maybe sour cream (to hit fat + acid), and I'll crumble some salt and vinegar potato chips for more acid and some texture diversity.
Salt
Salts (kosher, sea, table, etc.)
Soy sauce
Fat
Butter
Sour Cream
Olive oil
Avocado
Bacon
Cheese
Acid
Sour cream
Lemon
Lime
Olives
Capers
Balsamic vinegar
Rice wine vinegar
Red wine vinegar
White wine vinegar
Heat & Texture
Grilling
Browning
Roasting
Slow cooking
Simmering
Braising
Eggs