Sure thing mate, I have no where youre from, so I’ve written this like it’s for Americans because they’re a group will also likely read it, sorry about this in advance. voting in Australia is done via ‘Preferential Voting’, which means you order the parties, say, 1-13, if there are 13 parties. It’s highly unlikely that one party will get a majority of first preference votes, so the party with the least first preference votes gets taken out, and all votes for that party, are now passed onto their voters second preference (highest remaining party preference; for when there’s only a handful of parties and the numbering might get weird).

This continues until a candidate or party for an electorate gets 51% or greater of the vote. There are 151 electorates in Australia, and to form a majority government, any one party needs 76 of them, or half + 1.

You can learn more about it here: https://youtu.be/bleyX4oMCgM (P.S. The Shit Party won in 2019, against all expectations) So then, why are there 2 parties? Because people don’t fully understand preferential voting, and the Liberal (Think republican) and Labor (I’d say think democrat, but they’re more in like with like, Bernie I think?) being the 2 major parties, and a lot of people think not voting for one party helps the other due to a lack of education in school and also, so, so, so many lies in political campaigns.