A few things I wish someone had told me long ago - or at least that I had listened when someone did ( a list primarily culinary):
1) Throw away ceramic pie plates, no matter how cute they may be or how many you might receive as gifts. They are useless.
2) Oven-roasted potatoes take at least twice as long as it seems like they should. Short of actual burning, it's almost impossible to overcook a roasted potato.
3) You will never, ever use frozen spicy chicken broth. If there's a chicken carcass with lots of spice on it, just pick it bare and toss it out.
4) Always buy two bottles of glass cleaner, two cans of scrubbing cleanser, two rolls of paper towels. Keep one each in the kitchen and the bathroom. See how much cleaner your rooms stay.
5) Put all the bits and pieces for stock in ONE freezer bag, dummy.
6) Don't waste your vote on a third party candidate.
7) Refrigerate your apples.
8) Those weird "produce storage" bags with the tiny holes? They work.
9) Buttermilk freezes perfectly.
10) A small food processor is a waste of space. Buy a big one or skip it.
11) You will not grind meat as often as you thought you would.
12) If you like a cookbook writer, buy everything s/he ever wrote. You'll probably use those books twice as often as any other additions to the library - unless you luck on another favorite. At which point, repeat.
13) On a similar note, you will never regret buying another Tom Waits album.
14) A kitchen drawer needs scissors, binder clips, paper clips, rubber bands, and note paper. Having to run to the desk for these items is annoying.
15) Every home needs a cat.
16) White pepper is freakin' delicious.
17) Celery seed helps out a lot of dishes - anything with mayo, anything with beef.
18) Really good dried pasta (bronze-die) is actually worth the money.