where, 200ema can be used to watch on-going long term trend, dynamic support levels for an instrument
50ema can be combined with 200ema forming a Golden Cross strategy, 50ema can be used as short term as well.
Lastly, 20ema could be your swing entry, exit, pullback , triple crossover for an Ambush entry, Retest entry, etc.
it is one of the most versatile setup where you can trade an instrument by crosschecking and confirming with multiple parameter
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.