Australian law has “unfair dismissal” - if your employer terminates you for “unfair” reasons, then you can take them to court, and if you win you either get reinstated or compensated. Very different from the “at-will employment” which prevails in much of the US. (I put "unfair" in quotes because it is ultimately about what a court concludes is unfair, based on the legislation and case law, which might not be the same as what you or I think is unfair.)

It is worth pointing out it only applies if your annual salary is less than the "high income threshold", which is currently AU$175,000 (approximately US$107,000). They increase that amount every year, and their definition of "income" excludes certain things (such as bonuses). If your income is above that, you can't sue under unfair dismissal law, although you still can sue for common law breach of contract (which is more difficult, however–employers generally try to word employment contracts to maximise their freedom to terminate you, although there is always the chance a court will find the relevant terms of the contract legally invalid, at least as applied to your particular case.)

https://www.fwc.gov.au/high-income-threshold