At the table
How an Italian menu is built
Antipasto, primo, secondo, contorno, dolce. What each one is for, and why the pasta is not the main course.

An Italian menu is not a list of dishes you choose between. It is a sequence, and the headings tell you where in the sequence each dish sits. Once you can read the headings the whole thing becomes obvious, and so does the reason a plate of pasta arrives before the meat rather than with it.
The sequence
Antipasto. Before the pasta. Cured meats, marinated vegetables, seafood, things that need no cooking at the moment of serving. Skippable.
Primo. The first course proper: pasta, risotto, soup, gnocchi. This is the starch course, and it is the one foreign visitors most often mistake for the main event because it is the one they came for.
Secondo. Meat or fish, on its own. It arrives with nothing beside it. This is not meanness, it is the structure: the accompaniment is ordered separately.
Contorno. The vegetable or the potatoes, listed in their own section and priced individually. If you want something alongside your secondo, this is where it lives.
Dolce. Dessert, then coffee, and possibly an amaro after the coffee rather than before it.
What you are actually expected to order
Not all of it. A full five-course meal is a Sunday or a celebration, not a Tuesday lunch. Two courses is entirely normal: an antipasto and a primo, or a primo and a secondo, or a secondo and a contorno.
Ordering only a primo is fine. Ordering only a secondo is fine. Ordering a primo and a secondo and nothing else is fine, and it is what most people do.
The things that mark you out
Ordering a cappuccino straight after a meal. Milky coffee is mostly a morning habit, and this is the one moment it reads as foreign. Mild surprise rather than judgement, and no one will say anything.
Asking for the pasta and the meat together. They will do it. It reads as though you did not understand the menu, because you did not.
Asking for parmigiano on fish. This one produces a visible pause.
Waiting for the bill to arrive on its own. It will not. The bill comes when you ask for it, and lingering is expected rather than rude. See coperto, servizio and the bill.
What the menu does not tell you
The daily specials often are not on it. They are recited, quickly, and they are usually the best thing available because they are what came in that morning. If you understand nothing else of the recitation, "il pesce di oggi" and "fatto in casa" are worth listening for.
A menu that exists in six languages with photographs of the food is telling you something about who eats there. Not always something bad, near a station or a monument, but something.