Please note that all COVID-19 emergency border measures have ended:
https://travel.gc.ca/travel-covid

For General Information, please check:
https://www.cbsa-asfc.gc.ca/travel-voyage/td-dv-eng.html#s3

For a list of Visa-required Countries, please click here:
https://www.canada.ca/en/immigration-refugees-citizenship/services/visit-canada/entry-requirements-country.html#visaRequired

For a list of Visa-exempt Countries, eligible for an Electronic Travel Authorization (eTA):
https://www.canada.ca/en/immigration-refugees-citizenship/services/visit-canada/entry-requirements-country.html#visaExempt

Electronic Travel Authorization (eTA) https://www.canada.ca/en/immigration-refugees-citizenship/news/video/electronic-travel-authorization-what-you-need-know.html

We would be pleased to assist you with an invitation letter to support your visa application.