Learn about taxes and get a good tax guy. There's a lot of "hacks" you could use to significantly reduce the amount you need to pay to the tax office. Best case scenario - you own an investment property which means you can write off all expenses, including mortgage interests.

Before buying a house, learn about home loans. Get yourself an offset account and for investment property get an interest only loan. Refinance your loan every time there's a better deal.

Put all your payments, bills, rent, etc. on a credit card that earns you some points. Over time you will get free stuff just for paying your bills.

If you can afford it, put away 10% of all your income to a savings account. If 10% is too much put away as much as possible.

If you're into risk, invest into stocks. I would recommend long term investments in well established companies that will give a nice return in 5-10 years. If you're a dare devil, look into penny stocks with large dividends.

Stay away from crypto and "lucky shots". If it's too good to be true it's not worth it.