How to trade RSI?
Buy: When indicator shows that price is in oversold zone 0-30 it's a "Buy" signal
Sell: When indicator shows that price is in overbought zone 70-100 it's a "Sell" signal
Settings: The default setting is 14 (length). I advise you to use different timeframes and try different values, such as 30/50 and even 100 on a very large timeframe. You may notice patterns that will help you to trade.
How to get: Go to Tradingview.com website, go to the chart, open "Indicators", then search for "RSI" or "Relative Strength Index"
An important note:
You can use different levels to determine if an asset is oversold or overbought. 30 and 70 are common, however I suggest looking to buy when the asset is below 25 and sell when the asset reaches 85. Above 90 means it is heavily overbought.