My friend has just begun his trading,Which are best to start the trading with Bitcoin or Alt coins?
Buy and hold bitcoin while having altcoins, choose those that has large volume so you can trade freely and you don't have problems when you are about to sell them.
Is it a good idea to strt the trade for beginners in the bearsih market ?
Bull or bear, trading is recommended.
If so,Which is the better exchange ?
Binance/kucoin is fine.
One thing that your friend need to remind, trade only with an amount that's affordable to lose.