How to load a dishwasher.
Where additional supplies of milk, paper towels, etc are kept.
How to fold fitted sheets.
Where to find the best price on kids clothes.
What size Tupperware to use for leftovers.
How to get a variety of stains out of clothes.
How to put a new roll of t.p. onto the holder.
When leftovers can be thrown out.
* disclaimer: Persons other than moms may know some of these tidbits, but on average the aforementioned items are mom knowledge.