Distrust anything that one can print ink on.
People really should learn to understand again the difference between credit money, and commodity money.
Also it would be essential to learn again the difference between investing based on uncovered credit, and investing what before has been saved in true value/commodity. The latter works well, but forms lasting increase of values in a slower fashion. The first seems to go fast, but only builds illusions that necessarily must collapse.
There is no money worth the name that can be created out of nothing.
Any boom necessarily gets followed by a bust.
No matter how poor somebody is, credits will not get him out of it. He needs to save a little bit - and once having saved a bit then he needs invest that.
You cannot consume yourself out of debts. Not personally, and not national-economically. Claiming that that is possible is probably the most destructive part of Keynes' big fairy tale. No matter whether the negative consequences are quick or take a while to form up: they always come - sooner or later.