An NFL blindside block is a 15-yard foul defined by the blocker’s path and forcible helmet, forearm, or shoulder contact. Learn the key exception.

A horse-collar tackle is a 15-yard NFL personal foul. Learn which collar and nameplate grabs count, the key exceptions, and how replay assistance works.

A facemask foul requires more than incidental contact. Learn the NFL grasp-and-control standard, 15-yard penalty, helmet-opening rule and replay limit.

Roughing the passer is a 15-yard penalty with an automatic first down. Learn the one-step window, protected contact areas and what changes outside the pocket.

A chop block is an illegal high-low double-team on the same defender. Learn the NFL definition, 15-yard penalty, reverse chops and the cut-block difference.

A cadence is the quarterback’s full pre-snap rhythm. Learn how snap counts, hard counts and silent counts keep the offense synchronized and test the defense.

A bootleg fakes a run one way and moves the quarterback outside the pocket the other way. Learn the routes, reads, naked bootleg and defensive counters.

A hot route is a quarterback-and-receiver adjustment that replaces an unblocked blitzer with an immediate throw. Learn the protection math, routes and counters.

Flood sends three routes to one sideline at deep, intermediate and short levels. Learn the quarterback read, why it beats zone and how defenses counter it.

Fantasy football stacking pairs a quarterback with a receiver or tight end. Learn when the strategy raises upside, when it adds risk, and how much one touchdown can score.