The Internet provides a host of information. Be careful with statements from Forums and Social Media Groups, use these as inspriation and check the official Websites. Things might apply and be correct for one person but not for you - you never know the full story and circumstances. Also people might have misunderstood something - or simply legislation can have changed.
Above all, we recommend to consult the Websites below.
If you are looking at a particular state to live in, the different Australian States/Territories have great Websites for immigrants, e.g Live in Melbourne/VIC (State Government Victoria).