First Time Investing Super (401k) and Personal Fund 28 Yrs Old

Hi all, From Australia Im 28 and starting to really focus on my future. Nothing short term. If you are or were 28 what would you invest in? No single companies. Talking ETF etc. Is just a High Growth a good option? Should I be going International Shares? Have a cash balance for when the market swings and discounts are available? My Super fund and Personal are very good at what I can invest in. Let me know what you think.