Should I put my money 50-50 into local ETFs (like STI ETF) and all world ETFs?

I would suggest just going with a full All world ETF. Singapore is a tiny tiny market and the world ETF would already include Singapore (very tiny portion)

This way you can capture the gains of the biggest markets in the world.

The best ratio is one that fulfil your investment objectives and risk profile. Therefore, go back to the basics by understanding yourself and your goals. From there, build your portfolio around you.

There are many tools in the market that is capable to help you grow your money. Yes, you should consider other investments if your goal is to create a proper well-diversified investment portfolio.

Here is everything about me and what I do best.

I will go for global 85% and singapore 15%. There is no need to be heavily invested in Singapore. It is under performing and you are exposed to higher concentration risk.

Hi anon,

There's no 'good' split. It all depends on what you are looking for. Naturally, you'll be more familiar with the local companies in our ETF compared to other countries. But I'd urge you to diversify. If not globally, at least regionally (e.g. Asia Pacific). Staying with a single country ETF is actually very high risk, concentration wise, and Singapore in particular is quite stagnant when it comes to growth.

Think about how the world economy will grow in the coming decades (in general). That is probably where you'd like to be vested in.