A crypto chart may differ from platform to platform, but they’re all generally providing the same kind of information. You can find them on public sites such as Yahoo Finance, crypto-dedicated sites ...

The relative strength index (RSI) is a momentum indicator that measures the magnitude of recent price changes to analyze overbought or oversold conditions.

Investors who read stock charts use moving averages, price action and volume signals to sell. Add to that toolbox a simple straight line.