Learning from mistakes doesn't mean YOU have to be the one making the mistake. Seven out of 10 people live paycheck to paycheck so there's plenty of evidence this is no way to live.
You see the fancy cars, boats, and expensive vacations. But, later pay attention to the unkempt house, overgrown lawn, and frowns. They all frown!
Personal finance simply means NOT spending what you don't have, nothing more.
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