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From personal experience, never in my life has school, family or anyone ever actually taught me any laws or showed me where I could consult them myself, and I have already reached legal age a couple of years ago.
The answer from @user6726 is a good one. But, I'd like to add to it by pointing out that the body of law applicable to an individual is usually much, much smaller than the entire body of law. I'm a lawyer who has been in private practice for almost 25 years with an extremely diverse practice compared to the average lawyer, and I've never even looked at perhaps 80% of the laws on the books in the states where I practice, and even less elsewhere.
By statutory and regulatory volume, the vast majority of statutory and regulatory law is applicable to either the internal operations of government, or to the way in which regulated industries and business transactions are conducted. And, it is customary for people in situations in all of those situations to have professional intermediaries such as lawyers, realtors, brokers, architects, general contractors, accountants, tax preparers, and consultants to assist them in complying.