What is the most important lesson you learned from attending school/college/university?

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School / college / university can teach you badly or normal. Real worl wants above that level.

You learn better when you do it by yourself (with some exceptions).
Don't start your path in adoolthood with college and/or university, start from understanding what do you want to be? What problem you want to solve?

When people say that you are talented, most often they mean that you are better in comparison to your classmates. Real world can smash you))