It's not simple at all. It depends on what kind of learning.
Intentional learning I find extremely difficult. If I intentionally decide to learn something, it either takes me much longer than usual, doesn't happen at all, or happens on a short-term basis where I can learn it just long enough to, say, pass a test, and promptly forget it (thank you, American education system!).
Unintentional learning happens without my effort. I'll just be doing things and later find out I've learned something. It's unpredictable, involuntary, and takes place in very odd ways sometimes. Such as doing something a few times, not doing it for years, and doing it again and suddenly being far better at it because my brain has been processing it in the background all that time.
So all I learned from school were essentially sociological lessons about events that happened while I was in school, rather than the material. (Unless you count learning the material in the short term and spitting it out again and then forgetting it, which I was good at for awhile in childhood and then lost the ability to do somewhere in there when my brain felt like it melted.)
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams