If you have no idea about investment, the best strategy is ETF investment.

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If you have no idea on how and what to invest, the best strategy is buying ETF of S&P by monthly basis.

ETF symbol:SPY

It gains around 10% annually with long performance history of 40 years.

 

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This strategy is extremely simple: save a little money, leave it be, trust in the market’s historical upward trend and let compound interest do its work.
The magic of compound interest is amplification of investment return.

Based on the first post example, account will be doubled by 7 years, 2.5 times by 10 years, and 6.7 times by 20 years.

 

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If we invest by monthly basis, you can retire after 20 years.