​The Norwegian Directorate of Health: 

Corona (information in English)

Helsenorge

Coronavirus disease - information 

The Norwegian Institute for Public Health

Coronavirus disease - advice and information

Advice for people in home quarantine

Advice for patients isolated at home with coronavirus

WHO

Coronavirus disease (covid-19) outbreak - information

Information about the coronavirus (available in multiple languages)

General information about coronavirus in several languages (The Norwegian institute for Public Health)

Home quarantine and home isolation (The Norwegian institute for Public Health)

Information about the coronavirus (The municipality of Oslo)