I'm currently in my late 20s and have setup my emergency fund and started investing via RSP (STI ETF). How should I start investing the rest of my money?

Since you're familiar with STI ETF, i would suggest looking at overseas / global stock ETFs as the next step to compliment your portfolio. You can potentially get better diversification and yield with products like CSPX, VWRA, IWDA, etc.​​​

If you like to invest in individual stocks and reits, you have to do your own research and improve your knowledge as there is much higher risk as compared to investing via rsp.

It depends on your risk level

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if you want something “safer”

• singapore savings bonds
• blue chips
• ETF via robo advisors

if You can stomach higher risk

• stocks
• forex

in any case please read up and become savvy about the investment before jumping into it !

you can look into robo investors for a start! also, start reading up on investments. Seedly has a lot of good resources! :)