This is the 969th most frequent Japanese word.
学ん
"学ん" is the stem form of "学ぶ" (manabu), meaning "to learn" or "to study."
Here, '学んで' is used in its continuous form, showing the habitual action of learning.
私は毎日新しいことを学んでいます。
I learn new things every day.
In this sentence, '学んだ' indicates a past action of acquiring knowledge.
彼女はその経験から多くを学んだ。
She learned a lot from that experience.
The word '学んでいる' is used to illustrate the ongoing process of learning.