The six principles are:
Don't bore your child especially by going too slowBe relaxed, don't pressure your child
Be joyous
Be inventive
Answer all your child's questions seriously
Have one to one time with them to read (without any other distraction (like the TV in the background)
For more details: Early childhood education blog and
introduction video below on the institute for the achievement of human potential
If you are interested in the books then here is the link. if you purchase from this link you will not be charged any more, though I will receive a small commission which helps keep this site updated.