Is a Canadian visa necessary if I travel Europe/Toronto/Los Angeles? [duplicate]

I planned to visit USA, landing in Los Angeles from Milan.

The flight has a change at Toronto, where, if possible, I won't exit the international area, and then take another flight from Toronto to LA in 2 to 3 hours.

Assuming I'll ask for a USA visa, is a Canadian one requested for this sort of transfer, or do I just need the USA visa?

EDIT : I think my question is different from the one linked above, because I'm not interested in entering the country, just waiting for the next plane

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Do you need a visa to visit Canada from Europe?

All EU nationals are considered visa-exempt for stays up to six months but all must complete an Electronic Travel Authorisation (eTA) before boarding their flights to Canada. Visit www.canada.ca to apply for an eTA which is valid for five years or until your passport expires, whichever comes first.

Do you need your passport when flying to another city in the same country Canada?

Canadian and US citizens travelling between US and Canada must still carry a valid passport even when travelling with a Nexus card. US passport card may not be used for international air travel.

Which countries do not need visa for Canada?

Visa-exempt (eTA eligible) travellers

Anguilla.
Bermuda.
British Virgin Islands.
Cayman Islands.
Falkland Islands (Malvinas)
Gibraltar.
Montserrat.
Pitcairn Island.

Can I travel from Italy to Canada without visa?

To enter Canada as a tourist, Italian citizens do not require a visa. All you need is a valid passport and sufficient funds to support yourself and your dependents during your stay in Canada. Travellers to Canada do not require machine-readable passports.

THE SCHENGEN ZONE TRAVEL EXPLAINED - DIGITAL NOMAD TV

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Rachel Xiao, Roberto Nickson, Paul Deetman, Vincent Gerbouin