書: write; document; book; calligraphy. JLPT N5; 10 strokes.
書 means 'to write,' and in compounds, 'document, book, calligraphy'.
On reading: ショ in 辞書 (じしょ, dictionary), 図書館 (としょかん, library), 教科書 (きょうかしょ, textbook), 書類 (しょるい, documents), 書道 (しょどう, calligraphy), 読書 (どくしょ, reading).
Kun reading: かく (書く, to write): 手紙を書く (to write a letter). In compound it becomes がき: 落書き (らくがき, scribble), 下書き (したがき, draft). It is read かき in 書留 (かきとめ, registered mail) and がき in 葉書 (はがき, postcard).
Remember: for 'to draw, to paint' another kanji is used, 描く (かく or えがく). In dictionaries 書 is classified under the radical 曰, not under 日.
手紙を書きました。
tegami wo kakimashita.
I wrote a letter.
Follow the steps in order. Each new stroke is highlighted.
Stroke paths: KanjiVG, CC BY-SA 3.0. Sequential diagrams derived from the original paths.