These weren't my mistakes, but it happened on other people:
1. Hold your coins in centralized exchanges, if the CEX got hacked, they lost all of their coins.
2. Buy shitcoins, instead of making money, they're in loss.
3. Privacy, people didn't mind to publicizing themselves if they own Bitcoin, until they being targeted by $5 wrench attack
4. Buy Bitcoin by relying on someone else advise and use emergency funds, it make them can't hold for long term and might sell in loss.
5. Thinking Bitcoin will make them rich, if they didn't have money, they can't even buy Bitcoin.
1. I did never hodl my coins in exchange for long unless I do trading.
2. Yeah recently this is what I doing and I have lost more or less $1,000 from shitcoins alone.
3. Here in my area few only knew what I did online especially crypto but I am not posting anything crypto related on my social media account.
4. Never did on this one instead I converted my Bitcoins to Altcoins and that's where I lost most of my money.
5. Yeah this is most common problem for some people because they are still interested in "get rich quick schemes" which I am not a fan of especially in crypto because I know the consequences already. .