Hey I'm new to that crypto game and wanna make some money

Have bought into BTC and have sent it to bitfinex now and wan't to start trading and investing later.
A friend of me who is in the game for while told me that almost all coins are crap and I should hold only BTC and maybe Monero but not now because prices are still too high.
I'm thinking now about to short Ripple, IOTA, Litecoin and Ethereum.
So my question is what is the most worthless shitcoin that make me the most money with shorting and how low can it go?
You have chosen good coins for investment, but I do not advise you to invest in Ripple. I think this is a bad coin for investment.