People who fetishize self defense carry will always have loaded and unlocked guns in the house because they are afraid of someone breaking in at any moment and they might need to play John Wick: Home Edition. Those kinds of people also teach gun safety because they think responsible handling of firearms is important.
They just don’t understand that accidents are far more likely than a home invasion, and children are children even if they are taught gun safety.
Another great example is probably starting a fire only using materials from the environment. Anyone can learn how to do so, but most people never have it come up during their lifetimes!
Someone who knows knapping and how to start a fire is 90% of the way to surviving long term in temperate wilderness. Yeah, building shelter and knowing what to eat are important too, but making sharp things and creating heat are the two things that are make or break in a survival situation.
Speaking of not leaving written records, a large number of cultures had strong oral traditions that passed information down for thousands of years. Oral traditions have the additional benefit of being taught personally, allowing for time to ensure it is actually understood! It does have the danger of being lost when the culture changes significantly.