The BJ keys on the strong side of the formation or the LJ' side if both sides are equal. He normally keys on the outside receiver and the wingman keys the TE or a FL or RB coming out of the backfield. That's a very simplified explanation and there are probably exceptions, but that's basically it.
The NFHS Mechanic's manual has a new section this year that addresses keys. If you didn't get one, you need to.
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