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The beginning of investing occurs at the moment when the investor does not spend free money, but invests it in growth. There are resource-intensive types of investments, so you will not invest in real estate if there is no amount to purchase it. But you can invest on a bank deposit or buy shares from a small amount, I advise you to learn more about this here https://adamfayed.com/17-best-stocks-to-buy-in-singapore-in-2023/