Just find coins that will live in near future, find appropriate buy and sell point, make stop-loss
Well I think bitcoin will be the best coin in this age where we are in need of digital currency specially the bitcoin, price of bitcoin will get better with time so now bitcoin is the best currency to buy and hold for long time,. Buying at low then hold with patience for long term is one of the best profit making strategy which I am using now a day to get profit, buy now, hold for long time then sell at high price.