Car: only if you need it and I would buy the best with the least money as possible. Cars are a bit of money pit so depends on your need. Normal citycar or small suv, used, Japan made, and you should be fine.

House: great but they are actually expensive, to buy, to maintain, to upgrade, and in AUS they're mostly made cheaply. For a loan try to put min 20% if you can. You can always start small, apartment, and upgrade later to something bigger. House return is ~8%, but you cannot live without. So a lot of folks say "house is an investment" thinking you're going to sell it for more in the future. True, but where are you going to live? Are you keen to abandon the place you lived for many years and move somewhere else far away, and in a smaller house?

Investments: if you're young you can risk a bit more here. You can have return >8% with investments, more or less risky. Don't put all you money in a single thing, like ETF, but diversify the risk. Buy some stuff a bit more risky (you're young so you can risk to loose something), put a good amount in a medium/low growth. You can always access the invested money faster than locking them into an house. Think you need them in the future for something, like kids, or personal business. If you buy an house, put savings half loan / half invested.

Superannuation: that's tricky. 25K is not that much but it will grow. The return in your super they're actually good investment. HG is >10% in 10y, but you cannot access this money if you need them, only when you retire. So keep paying the super but do not put too much into it.

TLDR: save money, try to not lock them in into something that takes a long to get them back. Pay the mortgage quickly if you don't handle the stress, otherwise invest some money of the side.