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Questions like yours usually won't fare very well though, as they could easily be answered by a google search. Though if we see you're putting the effort in we'll go above and beyond to help you.
To answer your question. The usual entry into cryptocurrencies is via Coinbase. You can simply transfer them some of your Australian Dollars and exchange it for Bitcoin, Ethereum, Litecoin or Bitcoin Cash. If you plan to invest in other cryptos you then need to transfer those to an exchange like Binance.
You can see which currencies are listed on which exchange if you visit Coinmarketcap.com and search for the coin.
If you want to protect your investment you shouldn't leave it on an exchange after you bought it. You can store your coins or tokens in so-called wallets. There are many different ones so you need to research yourself, which one suits you best. But no matter what you do, make sure you have a way to recover those wallets. Don't worry, every tutorial you find online will go into great detail regarding this. Oh and think about getting a hardware wallet like the nano ledger S for that extra bit of protection.
All that being said, please think carefully about whether you want to invest your money in cryptocurrencies or not. Judging by your question it doesn't seem like you have researched the topic a whole lot. There is a lot of money to be made, but also a lot of money to be lost.
The opportunity isn't going away anytime soon, so please take a moment before you throw your money at something you know little about.