Traditional use of is to use it as an "Overbought" and "Oversold" indicator. A more uncommon/unknown use, especially among new traders, is to use is as a "Momentum" indicator. I personally like to look for stocks where RSI>50
Default settings are set to color all bars red when below 50, and white when above 50, but try for your self setting different colors above 70, and below 30 to better see overbought and oversold conditions. I got a lot of requests for this script and I hope it helps you in your trading journey :-)
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.