The problem with some people is that their expenses are always more than the incoming source of income, because most people lack discipline.
Some people buy things that are not that important and that they don't really need.
That's why any of us should really know how to manage money so that it doesn't happen to us that we only have expenses instead of having money saved for the future,
you know what I mean.
Nowadays, I think many people, when they have money, spend it on things that aren't really necessary. I believe this happens because they prioritize their wants over their needs, such as following current trends. For example, in my neighborhood, many young people have dropped out of school and should be looking for work to meet their own needs or support their families, but what they often do is take out online loans to get money or engage in online gambling.
I agree with what you said: we must be able to manage our money well, because after all, we must be able to prepare for a better future. If we can't dedicate discipline to ourselves from the start, it may be difficult going forward.