I just made this video because, this question came up many times in Pine QA. In this video we are trying to load default Bollinger Band indicator from Tradingview and convert it into strategy.
Below are the steps
Load the indicator on chart
Click on source code (curly brackets next to indicator title) to load the code into your pine editor.
Make copy of the script. Remove the indicator on chart and load your copy of the script from pine editor
Replace indicator call with strategy call
Define your entry/exit conditions for long and short
Add strategy.entry, strategy.exit, strategy.close calls based on the conditions to generate trades on chart
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