Shrimp Boil Scampi

Name: Shrimp Boil Scampi
Ingredients: 12 to 16 cups water; 2 Tbsp. kosher salt, plus more to taste; 12 oz. uncooked spaghetti; 8 oz. small yellow or red potatoes, scrubbed, cut into 1/2-in. cubes (1 3/4 cups); 1/2 cup (4 oz.) unsalted butter, cut into pieces, divided; 12 oz. andouille sausage, chopped (2 1/2 cups); 1 lb. extra-large peeled, deveined raw shrimp; 1 1/2 cups fresh corn kernels (from 3 ears); 8 medium garlic cloves, thinly sliced (2 Tbsp.); 1 tsp. Cajun seasoning (such as Zatarain’s or Louisiana); 3/4 cup dry white wine; 2 Tbsp. hot sauce (such as Crystal); 1/2 cup chopped fresh flat-leaf parsley (from 1 bunch)