This is the 9606th most frequent Japanese word.
習う
To learn (from someone).
The word '習う' is used here to express the action of learning or practicing a skill, such as playing a musical instrument.
私はギターを習っています。
I am learning to play the guitar.
In this sentence, '習う' indicates the act of attending lessons or training to acquire a skill.
子供の頃、ピアノを習いに行っていました。
When I was a child, I used to go to learn piano.
Here, '習う' is used to describe learning a subject or knowledge formally in a class-like setting.