Not seasoning cooking water
Cooking pasta in bland water is a crime. The pasta police will come barging in through your front door and take you away to pasta prison. Seriously though, don’t cook pasta with unseasoned water. This includes making instant noodles. They come with sachets that you use to season the water as it cooks the noodles.
Saltwater will penetrate the hard exterior of the pasta and flavor it from within as it cooks. When cooking pasta, put in two tablespoons of salt for every quart of water you use. The water should be as salty as the sea.