Here are the different types of zones, so you won't have to ask

Hook zone= yellow zone that drops back about 5-8 yards

Flat zone= light blue zone, that guards the low portion of the field

Curl to Flat Zone= purple zone that guards agains curls, then plays mid field flats

2A zone= This is the deep, dark blue zone that guards up to 50 yards down field

nice sticky this will help noobs