The Canadian Government has advised avoiding all non-essential travel outside of Canada until further notice but there are certain exceptions.
Those who enter Canada are responsible for making suitable arrangements for mandatory quarantine, which begins on the day they enter Canada. They are required to submit COVID-19 related information daily, electronically. Further, violating any quarantine or isolation instructions provided to travelers by the officers is an offense under the Quarantine Act. It could lead to severe penalties, including six months in prison or $750,000 in fines. Travelers entering Canada should be quarantining for 14 days if they don't have symptoms. Moreover, foreign citizens won't be able to enter Canada if they have COVID-19 symptoms.
Depending on cases, the reason for traveling may be considered essential by a province, territory, or under Canada's National Strategy for Critical Infrastructure case. However, the Canadian government would only exempt if one's reason for travel is considered essential under the Quarantine Act's emergency orders.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.