To learn is to gain new knowledge or skills through study, practice or experience. You probably learn something every day.
Whether you want to dance, understand chemistry, or know the alphabet backwards, you will have to learn. One of the most common ways to learn is through teachers and tutors, but people learn a lot from books, hobbies, jobs, and their families. Books and other reading material are a huge source of learning. Someone sent to prison learns they have to pay for their crime, but they might learn many things because they have plenty of time to read.