All this could be simply put as investing.
Money they say makes more money. The richest people in the world today are not known to work by themselves but, they’ve been known to figure out means to make their money work for them. That way, they don’t get to put in more of the effort but, through their financial power, they are able to employ those who will.

Saved money don’t make you any money, at most, you get a tiny profit from the bank which has no significance when matched with what you’ve got saved and yet, it’s affected by inflation but,

Invested money, either Bitcoin, products or other assets of real value, they continue to appreciate with time and as money continues to devalue, they also continue to increase in value.