if you are new to the world of crypto you better make a purchase or invest in a good coin, and I think BCH is a good coin for you to buy.
I believe you should only invest in bitcoin at this time to minimize risk, investing in altcoin will be very risky if the bitcoin price drops, the altcoin price will drop sharply and you will greatly damage. So you invest in bitcoin, now bitcoin price has started to recover slightly to $ 7600 level and you can consider buying bitcoin at this time and short term trading.
Yeah with a market movement like this, btc would be your best bet. Bch has hyped out last year and though i think it can legitimately make money for you, it's below btc and eth.