I don't know if am wrong or right for opening up, even though I told him of the risk involved.
It will suffice to tell him that trading in cryptocurrency market is risky and that he must carefully control the risk. In addition, if you specify that he should have knowledge about the market, follow the news and do his own research before taking any action, there will be no situation where you have to take responsibility.
It is also necessary to remind your friend to trade in the cryptocurrency market with his savings that he does not need in short or mid term, because a beginner can lose all his savings in cryptocurrency market as a result of greed, and this can hurt him a lot.
Explaining how to trade to someone without experience even on stock market will take more than weeks. There is too much to consider before dipping one leg to this market unless OP guide his friend in every step.
These few weeks and possibly in the next few months, the market will experience a lot of turbulence and this will be a setback traders trying to live off the market. What I can suggest let the newbie trade in the bull run, so he can taste the greatness in crypto. Let him stop trading in bear.