sometimes he tells me that he's afraid to invest his money on the bitcoin due to the potential losses.
You potentially could lose everything you own. It's possible for your house to burn down, your bank to go bankrupt, your car to be stolen. Are you afraid it will happen? Are you losing sleep every night thinking about it? I sure don't.
Yes' there's a chance to lose everything when you buy bitcoin, but there's also a chance to lose it all when you continue to hold fiat money.
IMO buying bitcoin is one of the smartest things you can do in life.
Agreed that everything has risk and nothing is completely safe, but comparing losing our car or having our house burn down to investing in bitcoin is pretty lame. Incidents such as fire and theft are only rare incidents when we are careless or caused by mother nature and are very rare in life. Meanwhile, investing in bitcoin is much riskier because the market is like a battlefield, investing means you are on the battlefield and it will be much more intense than when you are at home.
Investing in bitcoin is a smart choice but if you are not ready then you don't need to invest in it and there are many other options available to you. Just like if you don't have enough skills to participate in the battlefield and stubbornly participate, it will only cause you to quickly lose your life.