I'm not surprised your friend lost all his assets in trading because if a newbie starts trading cryptocurrency without possessing proper knowledge about trading, the possibility of him losing all his assets is very high. If you want to become a good trader and maximise profit in your trading journey, you need to be aware of some points I will mention below.

1. You need to be very good with technical analysis so that you can read charts perfectly so that you can know when a token/coin can possibly make an upward movement or downward movement.

2. You need to know when to enter the market and when to exit the market.

3You need to know when to enter the market and when to exit the market so that other traders will not liquidate you.

4. Always use your discretionary income to trade because the assets you are trading are highly volatile.