Best Football Coaching Resources for High School Assistants

Question
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Followup To
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Followup To
Question -
My brother in law is a second year high school football assistant coach.  I am looking for a suggestion on top 5 books top 5 videos - instructional in nature

Thanks
Answer -
Dear Fred Hainsworth,
What Position does he coach?

He coaches offensive backfield and all defense
Answer -
Dear Fred Hainsworth,
What level?
High School Varsity

Answer
Dear Fred Hainsworth,
Let me know how things worked out for you. And do not forget that I am here to help you.

Your Friend,
Coach Louis.