The House of Reps as it's known for short is the primary organ of legislative assembly in the Federal parliament and most State parliaments. Legislation procedures follow the British conventions of readings and debates, followed by simple majority votes and then passed to the Senate. Members are voted in during general elections and the serving government is determined by a two-thirds majority minimum. By convention the Speaker is elected from the government's side (such votes are pointless since a majority guarantees election) and the government sits on the left side of the house. Independents and minor parties sit between both major parties on the so-called cross benches.
Also by convention, the Prime Minister is selected by the governing party, despite the illusion generated by both parties that elections are about which PM to have.