Visas to Canada are not required by passport holders from Canada, USA or residents of St. Pierre and Miquelon with a valid French passport.

An ETA is required by the following nationalities; 
Andorra, Antigua and Barbuda, Australia, Austria, Bahamas, Barbados, Belgium, Brunei, Chile, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Holy See, Hong Kong, Hungary, Iceland, Ireland, Israel, Italy, Japan, Latvia, Lithuania, Liechtenstein, Luxembourg, Malta, Mexico, Monaco, Netherlands, New Zealand, Norway, Papua New Guinea, Poland, Portugal, Samoa, San Marino, St. Kitts and Nevis, St. Lucia, St. Vincent, San Marino, Singapore, Slovakia, Slovenia, Solomon Islands, South Korea, Spain, Sweden, Switzerland and Taiwan.

Holders of a United states green card or permanent residence can also enter with an ETA.

An ETA costs CAD$7

Canada ETA

Canada Visa information

Canadian embassies and consulates

Foreign embassies and consulates in Canada

Canada has a working holiday visa scheme available to people aged 18 to 30 from Australia, Belgium, Chile, Ireland, New Zealand and South Korea.

Canada Working Holiday

Note: Please confirm details with embassy because policies do change with time

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Trudeau Climate Record Complicated by Gas Emissions Increase - The New York Times

After Canada's Marijuana 'Green Rush,' Pot Suppliers Struggle - The New York Times

Contemporary Canadian design celebrated in virtual exhibition - Wallpaper*

Canada suspends flights from India, Pakistan over coronavirus concerns | TheHill - The Hill

A year after Canada's worst-ever mass shooting, a ban on assault-style guns has already been in place for months - CNN

My 5-Year Prediction for Air Canada (TSX:AC) Post Bailout - Yahoo Canada Finance

JetBlue Will Fly To Vancouver (First Route To Canada) - One Mile at a Time

CORRECTING and REPLACING Canadian Bitcoin Platform Shakepay Partners With Marqeta To Power Innovative New Card Offering - Business Wire

Canada is the No. 1 Country in the World, According to 2021 Best Countries - U.S. News & World Report