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But you are talking about rich people who already have a lot of wealth and profitable investments. And what to do when you still have nothing, how to build this fortune, that will generate a constant financial flow?
Know your financial limits in advance and plan wisely so that you can achieve your goals in the long term.
You can't get rich if you don't have savings that you then invest in assets that can bring you profit, but first think about how you manage it while you can't ignore the necessities of life.
If you have sufficient income, I think you can plan this idea well. But on the other hand, if your income is only able to meet your daily needs, please don't expect something big without doing something big.