Learning. It's an ordinary, everyday thing.
Learning happens continuously, without effort. Writers who are writing regularly are also constantly scavenging for ideas and information, sometimes consciously, mostly subconsciously. The most powerful kind of learning is that of taking in and absorbing what's around you. Every book you read, movie you watch, person you talk to: they all inform your life and writing.
So go ahead. Just try joining the "Unschoolers" in their first annual Learn Nothing Day by learning nothing today. Betcha can't.