The Word of God is the best instructional manual there is and has been the primary educational tool in the home for generations of wise and good upstanding men and women of good faith and character.

"Hear, ye children, the instruction of a father, and attend to know understanding.
For I give you good doctrine, forsake ye not my law" Prov4:1,2

"But continue thou in the things which thou hast learned and hast been assured of, knowing of whom thou hast learned;
And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus.
All scripture given by inspiration of God, and profitable for doctrine, for reproof, for correction, for instruction in righteousness:
That the man of God may be perfect, thoroughly furnished unto all good works" 2Tim3:14-17