I'm assuming that what you're looking for is Marinara sauce; a basic tomato sauce for pasta without meat or fish. If so, here is my family's recipe:
Marinara Sauce
2 T. olive oil
1 large onion, chopped
2 cloves garlic, minced
1, 30 oz. c. Italian crushed tomatoes in puree - you may sub. 4 c. fresh tomatoes, skinned, seeded and pureed
1, 6 oz. can tomato paste
1 c. water
1/4 tea. salt or to taste
1/4 tea. pepper
1 T. fresh basil, finely chopped - or 1 tea. dried
1 T. fresh oregano, finely chopped - or 1 tea. dried
1 large carrot, peeled and whole

1 Dutch oven

1 lb. cooked pasta of any shape
freshly grated Parmesan or Pecorino Romano cheese

In a large Dutch oven, heat the olive oil over medium heat. Add the onion and saute until it begins to soften. Lower heat, add the garlic and saute about 5 minutes more.
Add the tomatoes and bring to a boil.
Mix the tomato paste with the water and stir the mixture into the sauce.
Reduce heat until sauce is at a low simmer and cook covered, for about 1-2 hours.
Taste to adjust seasonings and remove the carrot.
Serve over cooked pasta with freshly grated cheese and a fresh loaf of Italian bread.