Can investing in STI etf make one 'rich' ?

Yes and No.

What is Your definition of rich, and is to be rich or to become rich fast really

a desired goal.

To make it short and graphic: see the chart below to see that compared to the U.S. SP500 index the STI for the last 10 years had low potential to produce richness:

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Rich? no but you can be an okay rich by making a boglehead portfolio.

sounds confusing?it is actually very simple

What is a Boglehead investment philosophy?

• Boglehead investment philosophy simply follows a small number of simple investment principles that have been shown over time to produce risk-adjusted returns far greater than those achieved by the average investor.
• The basis of all of these principles is the idea that successful investing is not a complicated process, and can be accomplished by anyone with a small amount of effort.

• These ideas come from the investing philosophy of Vanguard-founder Jack Bogle, hence it is called the Boglehead investment philosophy

  9. Invest with simplicity

• The boglehead investment philosophy is simply following a 3 fund portfolio, a local stock market index fund ETF(Which in my case is the STI ETF: ES3 or G3B), a local stock market bond index fund ETF(Singapore bond index fund: A35) and an international bond index fund(Vanguard ETF)

Yup,with a boglehead strategy,you can get a decent return,for more information do refer to my blogpost: https://sonicericsg.blogspot.com/2019/01/post-7...