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What the statistics on this site mean and how they are computed
Each article defines one quantity, explains how it is computed here, and describes what moves it. They describe the measurements, not what to do with them.
What implied volatility skew is
Why options at different strikes on the same underlying trade at different implied volatilities, and how that difference is measured.
IV rank and IV percentile are not the same thing
Two ways of placing a volatility reading in its own history, why they disagree, and what a single past extreme does to each.
Reading an implied volatility term structure
Why longer-dated options usually imply more volatility, what makes a curve invert, and why total variance is the right thing to interpolate.