I mean it's about as easy as it gets. I don't know if my recipe is legit or traditional or anything, but here's what i do...
Half a white onion, diced. In with olive oil. Finely chop as much garlic as you like. Add it when the onions start getting soft and glassy. Pinch or fistfull of chili flake. Let that go for a minute or so then a good healthy glug of white wine.
Let that reduce by half. Add a can of san marzanos. I crush them with my hands as i put them in. I then add half a can of water and let it all reduce for a while. Get a bit thick.
Then i add the seafood. Whatever you like, really. I usually do mussels, clams, skrimps, calamari and some firm white fish cut into chunks. Cod is fine. Halibut is great. Scallops? Sure! Salmon? Why the fuck not? Let that go for 5 to 8 minutes and garnish with parsley and a bunch of grated parm. Squeeze of lemon and serve with crusty bread. It might be one of my favorite things.