To identify the trend, the 100 EMA and 200 EMA are applied to the chart for easy verification. Look for areas near the the red and blue EMA to start doing research
The Bollinger Band is to help you set short term expectations of the price volatility. While you can enter or exit near the high and low of the Bollinger Band, it is recommended to combine this with financial indicators as part of your analysis as well.
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.