String cheese can actually be pulled apart… into strings. My whole life I had been eating it sans fun.
I learned that the whole “seat up” versus “seat down” argument is moot. It’s seat and lid down so the toilet doesn’t spew fecal particles throughout the entire bathroom.
Neti pot!
Some women are unaware that the have separate openings for peeing and sex/babies. And they remain unaware in spite of their monthly “visitor.”
That a man CAN fart through his dick, sorta.
Leave the cover on and poke smaller holes in your Comet shaker top so you don’t shake too much out at one time (the pre-cut holes are freaking HUGE - your cleaner will be gone in no time with those size of holes).
I leave the lid down so the dog doesn’t drink out of the toilet. Otherwise, I wouldn’t bother since I live by myself.
My mother taught us to remove the sticky cover and replace it with just 2 holes uncovered - same effect, different approach.
As for me, I’ve learned to read most of a thread before clicking on links in the OP - I’ve managed to avoid things I’d find unsettling. I’m a delicate flower of womanhood, after all. 
I didn’t know raisins came from dried grapes … I wonder why they don’t have raisin wine?
Lots of people in the US have no idea the letter “Z” is prounounced “Zed” in the UK, Australia and New Zealand.
The incredible power of confirmation bias.
Check your sources.
Anecdote =/= Data.
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When I drove, I changed 2 habits the the dope showed me were irratating to other drivers. Now that I no longer drive, kinda moot.
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Question all sources.
Cite?
Wikipedia says they do. It’s called straw wine, but it’s very labor intensive to make.
I learned there are a hell of a lot of things not worth arguing about, even when the other person is demonstrably wrong.
“Someone is wrong on the internet.” I learned not to care (in most cases, at least).
I learned that aluminum foil, Saran Wrap, etc. have tabs on the end that you can push in to keep the roll from coming out when you use it.
That people will get irate and start civil wars over seemingly mundane stuff like which way to put the toilet paper* or whether circumcision is okay or akin to chopping off your kids arm.
I do this for liquids, just poke a small hole on the edge.
*Although I have my opinions, I put it off the roller and high up so a cat doesn’t destroy it. Same reason the toilet lid is down.
And in Canada. I have a hard time not pronouncing the movie title “World War Zed.”
Also, you’re probably arguing with a 13 year old. 
You know that little doohickey that holds the vacuum cleaner power cord? You can just turn it 180 degrees to release the cord all at once, instead of having to unwind and unwind and unwind and unwind it.
Haven’t found a way to save time putting the chord back, though…
On a practical matter, I learned about recycling a small sliver of bar soap. Wet the sliver, wet the new bar and mate them. It is awesome.
On a cosmological matter, I have learned I don’t know sheet. Thanks for pointing that out. I am humbled.
For both of these lessons learned, I am a richer person. Gracias!