In the app's terminology, a trip is the collection of journeys you will use your pass for. A pass can only have exactly one trip linked to it. A journey can consist of multiple trains.
Venice - Milan and Milan - Zug will need a reservation (€11 + €10, book on tickets.oebb.at). Zug - Luzern or other domestic trains in Switzerland don't need a reservation.
In the app's terminology, a trip is the collection of journeys you will use your pass for. A pass can only have exactly one trip linked to it. A journey can consist of multiple trains.
Venice - Milan and Milan - Zug will need a reservation (€11 + €10, book on tickets.oebb.at). Zug - Luzern or other domestic trains in Switzerland don't need a reservation.