The Australian Constitution gives the power to make national laws to the Australian Parliament—the Senate and the House of Representatives and the Governor-General (the Queen’s representative). The agreement of all 3 to a bill—proposed law—is required to make a law for Australia.
The Parliament’s law-making procedure allows for debate on and detailed examination of a bill, and for members of parliament to have their say. This ensures lots of different perspectives are shared and considered. The procedure also allows for a decision to be made on a bill quickly if there is general agreement, or after extensive deliberation.
More detail about the law-making process can be found in this fact sheet.