If you find it easier to cook the whole box, that’s fine, too. You can always eat leftovers later. The type of pasta you choose is completely up to you. Fettuccine noodles, which are like wide, flat spaghetti noodles, are commonly paired with Alfredo sauce. However, any type of pasta will taste great, so feel free to use whatever you have on hand.
If you want, you can salt the water to help flavor the pasta. Add a few shakes of salt from your salt shaker. You can also add salt later, after the pasta has cooked, or just enjoy the saltiness of the Alfredo sauce.
You can check to see if the pasta is ready by using a fork to pull out a piece and tasting it. If you like the texture, remove it from heat. Or smack a piece of pasta against the wall or another surface. If it sticks, it’s ready.