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

Canadian province will lift many restrictions a month before expected after hitting vaccination milestone - CNN

‘Bad faith’ US prosecutors misled Canada in Huawei case, court hears in final arguments - The Guardian

Colleges across the US and Canada are adopting virtual student IDs - The Verge

Canada fines travellers for fake vaccination and testing papers - BBC News

Canada’s Plan to Reopen Border Threatened by Labor Strife - The Wall Street Journal

Canadian Pamela Ware botches dive in spectacular fashion - Yahoo Canada Sports

In Manitoba, Farmers Race to Save Cattle From Canada's Drought - The New York Times

Opinion | Canadians have been in the dark about covid-19 deaths in hospitals. We need more transparency. - The Washington Post

Olympics 2020: Sweden, Canada ask for women's gold-medal match to be moved - ESPN

A Canadian diver who scored a 0 with a feet-first flop with the finals on the line said she wasn't going to give up - Yahoo! Voices