"Only invest an amount you can afford to lose."
Probably one of the most common advice I've heard when it comes to investing in bitcoin; and I've used it a lot of times too. But honestly, in our current situation where fiat is getting printed like hell, I started to use that statement less and less. It just seems that holding bitcoin is now totally necessary.
Of course it's a common opinion that we hear too often, but not everyone pays attention to it just out of passion. I mean greed, a lot of people are too greedy to think that they can get rich overnight where their inability to know something will only cost them. Volatility being something that will teach them about how to use money in investing, of course they need to know that investing money they can afford to lose is the best way to prevent financial and emotional losses.
Investing money they can afford to lose is the best advice ever, this is useful for everyone but we are really not responsible for their inability to understand this investment because in the case of any investment then we are the main person in charge. This is not about being stingy, but it is a good position to invest in. It is clear that any advice that is aimed at investment then I think they should consider it as non-financial advice.