What cultural faux pas should I try to avoid making in Adelaide?

"In Adelaide it is important to respect the local Indigenous cultures and traditional practices. Avoid making derogatory comments about Aboriginals and their traditions, as this is considered a major no-no. Additionally, people in Australia generally do not like to discuss their personal wealth, so try to avoid inquiring about someone’s salary or possessions. Moreover, be mindful of your littering habits; Australians take pride in their environment and appreciate visitors who do the same," remarked another expat who made the move to Adelaide, Australia, Australia.