So WonderTrend is a bit of both, a more stubborn PSAR, also a faster SuperTrend. The green is up, red is down, and yellow is caution helps traders read the chart patterns to enter and exit.
The result shown allows traders to visually "see" the current trend, and avoid dormant price action.
Rules that may be helpful:
1. The beginning of the color segments are good entry points. You'll notice that good trends are color shaded.
2. The best exits depend on your target and psyche :)
3. When there's no shading, it's drifting. The slope acts as a prevailing wind, and may predict the direction for the next color segment.
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.