I’m 25, with an average of 2k/mth after setting aside 1.5k in STI ETF, insurance, and all other liabilities. I don’t have time to start studying on REITS/equities in the short term. How should I manage the 2k?

Yes, you should be an informed investor, because it is essential and completely possible to be a DIY investor.

STI ETF is surely not the best choice (economy to small), but passive indexing ETFs are the one superb vehicle. (Never invest into mutual funds/unit trusts, that are much too expensive and (and because of that mostly) underperformers

I add 20 y and 10 y longterm charts of STI versus SP500.

https://seedly.sg/questions/what-is-your-genera...

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You should start studying as reits and equities are a major part in investment. If you do not have time, you can invest in robo advisor as they are a hands free approach to investing.

If you don't want to trade your time for money, you need to invest in knowledge. Save in short term cash instruments that can fetch you above 4% to gain exposure, but don't get in any comfort zone. That's how you move forward.

What you are doing now look good. Don't rock the boat. Review again in 5 yrs time. In the meantime hope you have the time to look for a spouse.