I only use and prepare ONE type of pizza, Neapolitan. So, this is from that perspective and three months in Italy interning in a pizza restaurant with 2 Neapolitan brothers doing the cooking. Ingredients in Italian cooking are the most important thing for flavor. Not a lot of them, but each one is quality. Sauce for Neapolitan is tomatoes and salt, period.However, San Marzano tomatoes are key. They are meaty, not many seeds or gel as they are a roma style tomato. Tomatoes go thru a food mill to remove seeds San Marzano DOP tomatoes are hand picked when they are ripe, not by machine, all at once, and you get what you get. In this way they have the best flavor. Buy a can of your usual and a can of SM DOP. open them both and have a look at the contents, then taste each - cold. See if you can taste the difference.
Then you add only bufala or fior di latte mozarella. Also, amazing flavor. Then the fresh basil. The dough is made with starter, aged a few days before use and only flour, water and salt.
With good ingredients, you don't need a lot of herbs, or spices.