I just have a quick question about implied volatility and options. I'm using black scholes here - https://www.hoadley.net/options/optiongraphs.aspx? For the volatility would I put historic volatility or relative volatility. Also, if I'm trading a put option wouldn't volatility be the opposite. So it the market is selling off wouldn't the volatility be increasing. If so, how would I find this volatility Thanks, Eric