Australians are quite laid back and friendly (if you’re a little lost, don’t be afraid to ask for help)
The most popular sports in Australia are AFL (Australian Football League), Cricket and NRL (National Rugby League)
Australia is diverse (there are people of many nations who live in Australia)
Public outdoor barbeques can be found at beaches and parks which you can use
If you’re invited somewhere, it is considered polite to bring something whether it be flowers, a salad etc.
Australians dress quite casually, feel free to dress as you please (In some higher-end restaurants and hotels they have dress clothes for example wearing enclosed shoes)