Indicators have nothing to do with predicting
Somehow very many people are clinged to the idea that indicators provide some sort of a predicting ability inside it, actually they do not, indicators in trading are neutral, they only measure the movements according to their formula. Whether you use Bollinger Bands, RSI, DMI etc., they all are simply calculations of movement (mostly calculated by candlesticks).
Measuring the lines, thinking that there is a confirmation candle on a EMA, or a indicator crossover makes no sense unless it can proove itself to be useful which it cannot do.
Moving average crossover strategies
These strategies always lack historical data, on the internet you'll find many videos on how to trade with crossovers, but none of them can proove their effectiveness with historical data, how do you really measure a crossover? It is also theoretically a difficult task for the system, because if we for example take a 15min DMI crossover as a buy signal, the moment the lines are about to cross, the 1min candlestick is jumping, saying that the lines have cross and a few seconds later, the crossover is gone, but then again it crosses forth and back, shall it measure from the 1st time it crossed over or the 2nd one? This makes no sense, and even if we take it as the 1st crossover as the real time of crossingover, the strategy still lacks many important data.
Missing historical data
So whenever somebody tells you to follow this or that moving average crossover strategy, because it has a record of some maybe 30, 40, 50 pictures of successful trades, it simply means that it is not checked, tested enough. There should be done enough testing with at least 5000 or 10 000 crossovers, this can only be done with servers. The second problem is that even though it is a crossover, it gives you no information of what is the target of the trade, is it 5%, 10%, 50%?