Green (EMA 7) for very short-term trends.
Red (EMA 20) for short-term trends.
Orange (EMA 50) for medium-term trends.
Aqua (EMA 100) for long-term trends.
Blue (EMA 200) for very long-term trends.
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 publication is governed by House rules. You can favorite it to use it on a chart.