Two tips for better pasta:

If you are going to serve the pasta with sauce, after you drain pasta, while it's still hot, grate some fresh Parmesan on top before tossing it with the sauce. This way, the sauce has something to stick to.

If you are not serving the pasta with sauce, just give it a quick rinse with very cold water after you drain it. That what it won't get sticky and you can skip adding butter or oil to the pasta.