FIREnomics covers the math behind financial independence and early retirement: savings-rate targets, index-fund portfolios, the 4% rule, and withdrawal strategy. Recent guides: why concentrated Mag-7 portfolios break 15-year plans through sequence risk; involuntary FIRE and bridge income after late-career layoffs; pricing a desired salary like an investor at a 40% savings rate; the expected-value math on $997 guru courses versus 15-year index returns; and where the 4% rule fails across 50-year retirements. Expected value and calibration first, with the numbers shown.