Dogecoin. you can learn how to trade, then micro trading /10 trades in 2 minutes) and at last margin trading.
actually, Dogecoin is also difficult to try. because people will buy big amount of dogecoin and sell it when the price is increasing even just 1 or 2 point.
and when the price is increasing, you get nothing cause you don't get the coin to be sold.
Good observation! The probability to get a trade depends upon own weight versus orderbook depths.
He could try DOCE/LTC markets on Cryptopia, those are pretty threadbare.
Or relocate to CoinGather or BitGrail if no affinity of switching for LTC exists. Personal decisions.