This is the most asked question about Hong Kong--and surprisingly, the answer isn't quite as simple as you might imagine!
China and Hong Kong, System of knowledge Wiki
China has decided to protect Hong Kong as a financial centre - OMFIF
USDA ERS - Provinces
Provinces And Administrative Divisions Of China - WorldAtlas
Views of mainland China and identity in Hong Kong
Hong Kong's Freedoms: What China Promised and How It's Cracking Down
China, Taiwan (Republic of China), Hong Kong (Chinese SAR), and Macao ( Chinese SAR) - Flytrippers
Is Hong Kong a country or a city? - Quora
Are Hong Kong and Macao countries or part of China? : r/China