Heat olive oil in a skillet over medium heat until it shimmers lightly

Add minced garlic and cook briefly until fragrant but not browned

Place shrimp in the pan in a single layer and cook until they turn pink and slightly firm

Sprinkle in salt, black pepper, and red pepper flakes, stirring gently to coat the shrimp evenly

Pour in the cooking liquid or broth and let it simmer until slightly reduced and aromatic

Add the cooked spaghetti to the skillet and toss until the noodles are evenly coated in the sauce

Stir in lemon juice and a splash of reserved pasta water if needed to loosen the sauce

Finish with chopped parsley and toss again until everything is well combined