I like the good old moving average trading. Among them I prefer EMA, which is good for coins with typical rapid price changes situations and for fast moving market (not applicable for BTC). Simply determine the uptrend and downtrend lines. As the price goes over the moving average line I buy immediately. When the price goes down below the moving average line I sell. It may be not the most profitable trading technique, as you buy and sell not at the extreme points, but it's the safest one.