In my PoV,
1 - Never do impulsive purchases
2- Never purchase something which you can't afford
3 - Never be greedy or foolish
I think the most important thing a living human being should do is invest their money, while you are investing your money do not forget to enjoy yourself and have a good life too, time wait for no one, invest your money and find a good way to enjoy it.
While on the journey of investing and getting rich many people have failed to live.