Here are links to online resources which provide common and public information, useful for personal finance. If there are any more important resources that are deserving to be here then please let the mods at r/ausfinance know.
Moneysmart: free tools, tips and guidance to take control of your money and build a better life.
Australian Financial Complaints Authority: free & independent dispute resolution for financial complaints
The ASX ETF investor course is an excellent series of videos that can help you learn more about ETF’s and how they work.
myGov – including the ATO lost super tool