Classic Aroon indicator with few changes:
1. Colors for trends: red line and red background = downtrend
green line and green background = uptrend
2. Crossover is signaled with an yellow stripe
3. Alerts are enabled for longs/entries and shorts/exits
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.