The easiest and fastest way would actually be by using
ShapeShift.ioJust select "Bitcoin Cash" -> "The crypto you want" and you can exchange them by sending your BCH to ShapeShift's address and after a few minutes, receiving the coins in your desired address. If the crypto you want isn't available at ShapeShift, simple send your BCH to an exchange like
Binance.com, sell your BCH for BTC and buy the desired altcoin.