Dice tomatoes, mince garlic, chop basil, and boil salted water.
Add spaghetti to boiling water, cook until al dente, reserve pasta water.
Heat olive oil in skillet, cook garlic until fragrant.
Add tomatoes to skillet, cook until softened, season.
Toss spaghetti with sauce, adding pasta water for silkiness.
Fold in basil and Parmesan, adjust seasoning, serve hot.