Don’t break pasta to fit it in the pot. Let the ends stick out until the submerged sections soften, about 1 minute. Then stir to bend the pasta and push it underwater.
Don’t add oil to the pot in an attempt to keep the noodles from sticking together―stirring with a pasta fork is much more effective. Oil also prevents the sauce from coating the pasta and makes cleanup a greasy proposition.
Don’t discard all the pasta cooking liquid. Reserve a cup before draining to add to sauces for seasoning and body.
Don’t rinse cooked pasta. It eliminates the flavorful starch that helps the sauce adhere; rinsing also cools the pasta.