2.1 Understanding Football Data - 2.1.1 Play-by-Play Data Structure - 2.1.2 Game-Level vs. Play-Level Data - 2.1.3 Player-Level Data - 2.2 Primary Data Sources - 2.2.1 College Football Data API (CFBD) - 2.2.2 Sports Reference - 2.2.3 ESPN and Official NCAA Statistics - 2.2.4 PFF and Premium Data Pro