I really want to hand down everything I know about gardening to my daughters.
Things like .... never pick your green beans while the plants still have dew one them.
The best time to plant your root vegetables.
How to properly plant things. (Usually not according to seed packet instructions.)
What vegetables should never be planted next to each other. Such as squash and melons. Sweetcorn and popcorn, and many more.
The harvesting and preservation of all the vegetables.
Gardening, especially if you depend on your garden to supply a year's worth of food for your family is a lot of work, but so worth it.