I have a friend who invests in cryptocurrency like me, he is an investor hold Luna and he has also lost quite a bit because of Luna. But what's more sad is his 2 best friends. Those two are also hold a lot of Luna's and Luna's crash causes them to lose all their possessions and become insane. As he said, one person has gone through the crisis and one has not. Those two guys who invested in Luna were all from my friend's advice. He said it was he who indirectly harmed them, money can be earned, but his friend are gone.
This is a sad story that I have heard. Through this story I want everyone to know 1 golden rule in investing is: never give financial advice to anyone. By the time you give them financial advice, you may feel like you're one step ahead of them, but if that advice is wrong, you could be the one hurting them.
The golden rule of investment is supposed to be "invest only what you can afford to lose" but idk maybe the golden rule of investment is not only one? And the rule that you said could be one of it. I gave out some financial advice to my friend and there is nothing wrong with it because in the first place, they are the ones that ask it not me.
From there they can agree that if ever they lose, they won't blame me for what happened to their money. Even if we know that we are one step ahead of them, we should not be confident with our ability but we must still be humble because at the end of the day, we can't predict anything that will happen in cryptos. luna coin for instance.