he went and sold his property to invest on Bitcoin without been knowledgeable about it. he went ahead and invest but loss everything because he doesn't know how to trade Bitcoin.
Do not get it wrong, your friend did not invested in bitcoin, he was trading which is another thing entirely. Bitcoin ATH is $69000. Bitcoin today price is $29800 now. Even if he invested in bitcoin at ATH, he would not have lost everything. And bitcoin will still get to $69000 and increase above the price, only what is needed is time.
Well I think op is still very confused about bitcoin himself and I'm shocked that he thought someone trading and his student is doing very fine today and yet he (tracher) still isn't clear if he thought him investing or trading 🙄
Well let me correct @op that bitcoin investment is entirely different from trading and when talking about trading, people who do this believe that bitcoin's price will rise or fall at given point in time either within minutes, hours, a day and so but while investing in bitcoin it is expected that you're holding it for a much more longer time like a year and above and not been moved by the circumstances around.