• 習慣しゅうかん — habit; custom
• 学習がくしゅう — study; learning
• 練習れんしゅう — practice; training
• 復習ふくしゅう — review (of learned material)
• 自習じしゅう — self-study

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習 combines the elements 羽 (feather, wings) and 白 (sun/day form). The image suggests flapping wings repeatedly — a metaphor for practicing or learning through repetition. That’s why 習 appears in many words related to study and habit.

日本語にほんごを習ならっています。
I am learning Japanese.

毎日まいにち練習れんしゅうすれば、上手じょうずになります。
If you practice every day, you’ll get better.