Australia is a country of striking landscapes, a rich ancient culture and one of the world's strongest economies. It is the sixth-largest country in land area and is the only nation to govern an entire continent.  Australia is a nation of boundless opportunity in a country of endless potential that is "open for business" and also the world's third most popular destination for international students.
 

Weather
Australia's climate varies greatly throughout the eight states and territories and seasons are at opposite times to those in the northern hemisphere.
Summer: December to February (from 17°C to 26°C)
Autumn: March to May (from 17°C to 25°C)
Winter: June to August (from 8°C to 17°C)
Spring: September to November (from 10°C to 24°C)
http://www.worldweather.org/en/home.html

Capital
Canberra

Language
English is the main language and only 15% of Australians can speak a second language.

Power Plug
Type I: The standard voltage is 230V and the standard frequency is 50Hz.
https://www.worldstandards.eu/electricity/plugs-and-sockets

Time
Eastern: GMT+10 hours
Central: GMT+9.5 hours 
Western: GMT+8 hours

Visa Information
Holders of HKSAR passport or BNO passport (with at least 6 months of validity) are required to apply eTA online, which is a simple process.

Currency and Exchange Rate
The Australia dollar (AUD) is used here and notes come in denominations of $1, $2, $5, $10, $20, $50 and $100. Coins come in 1c, 2c, 5c, 10c, 20c, 50c and $1 and $2.
100 HKD = Around 16.5 AUD

Useful Numbers
Police, Fire & Ambulance: 000
International incident emergency helpline:  1300 555 135 (Within Australia)
Outside Australia +61 2 6261 3305  

Funny Facts about Australia
i) Today's Australia is very multicultural with migrants from over 200 countries. 
ii) There are 16 UNESCO world heritage sites in Australia.
iii) Australia is only slightly smaller than the U.S.