Relative Strength Index (RSI) is a popular momentum oscillator developed by J. Welles Wilder.
The RSI indicator ranges in value from 0 to 100, with numbers above 70 indicating overbought conditions and fewer than 30 indicating oversold (Go long when RSI falls below the 30 level and rises back above it) or on a bullish divergence where the first trough is below 30.
If the RSI rises above 30, it is considered bullish, while if the RSI falls below 70, it is considered bearish (Go short when RSI rises above the 70 level and falls back below it
or on a bearish divergence where the first peak is above 70).

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