Emotional regulation and understanding. Most people never learn this either at schools or elsewhere.

The importance of savings and investments, especially when you're young.

That being agreeable is one of the greatest cheats in life. No matter how much you know on something, or how smart you are, if your personality sucks you won't get very far.

So many talented and skilled people I know failed because they just would not work with other people very well. It's extremely rare to be an individual talent skilled enough to overcome that barrier, so at least work on yourself a little bit so you don't die from pride.

So many daily small thzate kinda impossible to teach a whole class, but are easy to teach a single child (source: I work in a school):

• reading the clock. May sound weird, but some kids get it really early and quickly, some take more time. Thus pretty frustrating to teach the whole class
• tying shoes (I know too many kids with 8 or 9 years old who can't tie a knot, shoes are a good starter)
• generally small motor skills (crafts, crochet, weaving, whatever you want...)

And the one thing that school cannot teach and is also very difficult for parents: questioning authority

Cooking, each generation is losing the skill.

I teach all of my kids that "no" is a complete sentence. I want them to be very conscious of consent, but I also want them all to respect their own wishes.

Unrelated, I also teach them all how to throw a good punch and keep their god damned hands up and chin down as soon as I think they have enough self control not to abuse it.

Critical thinking skills - they’re actually very difficult to teach and constantly incorporating them into everyday life is super important

In my case social skills. I was the typical nerd. About 10 years after I finished school I figured out I could learn to get along better with people just like I learnt how to do complicated maths.

Schools are obsessed with academics because they tend to be more easily measurable. Therefore, they are spending less time building character, morals, and thinking skills. Teaching them how to be a good person is more important than ever.

Compound Interest.

and

If it seems to good to be true, you're probably getting scammed.

How to be kind.

How life works in general, things that you're required to do or expected to understand as an adult. For example, different types of bank accounts, credit card fees, how credit scores work and what they're used for, how government and elections work and how these impact people's actual lives (beyond just submitting your vote and naming the branches of government), how to read a food label and why they should (this might get a small section in health class), how health insurance works, etc.

Basically just how our society is structured and what that means for the individual.

More for people entering adulthood, but one thing school life never taught me was how to deal with uncertainty and structurelessness. How to keep moving when you don't know where you're going.

Financial literacy and responsibility, life skills: laundry, dishes, vacuuming, hygiene, cooking and recipe reading. General well being, teach them to be somewhat physical regularly and exercise with them to promote it more so.

This.

and for elementary school

Cooking, efficient cleaning, basic repairs

• financial literacy
  • teach them what money means and what their time is worth
• philosophy
  • teach them about multifaceted perspectives, there isn't good vs evil but multiple shades of gray
• resiliency
  • impose upon them that failure only happens when you learn nothing from your mistakes, everything else is just a setback
• health and medical
  • teach them about their body, what it means to eat nutrient rich meals, and first aid
• self-reliance
  • when you're the only person with a clue, you're your only hope, be your own advocate and rely on your own skills and judgment

all the other things like ethics, empathy, emotional IQ, constructive thought, etc will fall into place with a basic understanding of the above. the point is to challenge them and provide a support system for when they fall.

Real history that explains how existing power structures came to exist. Not the bullshit history that schools teach, which is just wrote memorization and usually ignorant of the most important themes of class struggle.

Do not pay for drugs in advance.

Media literacy, financial responsibility, mutual aid, critical thinking and critical analysis, reciprocity, playing music.

As a teacher for a decade. Read a clock, understand geography, science activities, history activities. We teach out of a manual now, and it's all so the admins can jerk off to higher scores for ELA and Math.

Laws are threats made by the dominant socioeconomic-ethnic group in a given nation. It’s just the promise of violence that’s enacted and the police are basically an occupying army.

Consent

Perhaps ethics

Also help them figure out what the fuck is wrong with them before it destroys their life.

patience, empathy, and compound interest.

I'd say argumentation. How to structure and analyse an argument, find flaws and questioning ideas.

I would have also said "proper source finding and research", "how to analyse a texts" and "cooking/diet" but thinking back, that was taught or atleast attempted but not done in a way that i understood its intend and reason until now. These also are probably only done in my country/state/school and due to my teachers

Go for the jugular

How to protect your mate from a bear.

Morality, mostly. School is okay at teaching information, but is pretty bad at teaching behavior and mindset.

If anyone is doing something that you don't like, or that hurts, you yell as loud as you can in your big girl/boy voice "stop that I don't like that"

Git

US history of subjugation of brown people

Resiliency. From a military perspective, if you care, I was told that generals are complaining about a lack of resiliency. People go to boot camp and make a mistake but they don't have the resiliency to fix their mistake and move on.

I think it comes from parents not wanting their kids to go through any bad experiences. They need to get comfortable being uncomfortable. I have noticed it with my family, but I don't have any kids so who am I to make judgements.

elementary logic like what is used in the clues by sam game does not take massive knowledge of other subjects at a high level yet only some colleges require it so even like a PhD can go through life without ever having had a course in it. Its maybe a bit easier to explain when they have been through things like algebra where math is a bit more abstracted. Still its easy enough to play the game with them and explain why a particular square must be a particular way. Its also good in that you can say you know I can't figure out this one so lets get the clue and show that its an important thing but you know its not easy. So it is this wierd subject that is basic enough to engage with a child on it but advanced enough to never really master it. I guess in some ways that makes it like chess.

Confidence in self-sustainability.

I don't know what a better word would be. I'm not talking about making some self sustaining homestead or whatever, just the act of creating, building, repairing or designing something without having a guide to tell you how to do it.

You know, "draw the rest of the owl", but I'm dead serious. Just draw that fucking owl. You don't need someone to show you how or to guide your hand through all the steps.

In U.S. public schools? How to read.

probably doing thier taxes, getting jobs and look at the job markets for many industries, something Public schools and even colleges are allergic to even discussing about. additionally, getting participation grades will not help you succeed in college, which is partially the k-12 districts fault, because students bring in the assumption that they will get easy As,Bs in certain college courses only to wash out even from CC. also discussing how military recruiters lurk around schools or public places to prey on the disadvantaged.

Hide your work and hide it's effects. Anything others can see is a weakness. Government can only tax you on what you earn officially, only things you show can be stolen etc. If you are having a good time it is in your best interest than nobody, except people you are having this good time with, know about it.

Food, in a lot of places.

...oh, you meant things they won't learn in school? My mistake.