"No school books, no tests, no quizzes..." John Holt

Well what, then?

Play is children's most important activity. It's the way they figure out how the world works, what part they have in the world. Scientists play with theories, writers play with words and ideas, inventors play with materials & concepts...

Work: No, I don't mean forcing kids to do chores, but allowing them to join you in your work at their level of ability and interest; helping them to find ways to their own work in the real world when they choose. Real tools.

Volunteering, starting a business...

Reading: Being read to (if and when you and they enjoy it); seeing others read for pleasure and curiosity; playing with books, letters, words, maps, puzzles, board games, comic books... No pressure -- some learn to read at 4, some at 12 & by the time they're 16, no one can tell the difference.

Math: Spending money or allowance; blocks, cards, dominoes; sports & games; origami; cooking, gardening; building a model or a tree house, measuring distance, angles, heat, light, weight, speed...

Science: Humans are born scientists. Encourage curiosity & help kids go where it leads: mud, pets, rocks, bugs, stars, trains, bicycles, fishing, swimming, computers...

Art & music: real materials and instruments, lessons & practice (if kids choose) or messing about with piano, recorder, ukulele, drum, clay, paint; seeing art & artists, acting, listening to music, dancing, playing along...

Doing nothing: thinking, dreaming, watching the clouds, imagining... Often "doing nothing" means kids are not doing what parents think they should be doing. Which means kids are doing what they choose, which is the best way (maybe the only way) people learn.

The point is, schooling, text books, and most "educational materials" are artificial, boring and limiting. Real life and real work are unlimited, unpredictable, fascinating. And kids know the difference.