Usage patterns
第〈数〉章the nth chapter
This book gets interesting from the third chapter.
〈人〉に章を授けるto bestow a medal or badge on someone
The government awarded a medal to the accomplished scientist.
〈事〉を章に分けるto divide something into chapters
I divided the report into several chapters.
胸に章をつけるto wear a badge or medal on one's chest
He wore a golden badge on his chest.
Expressions
章を断ち義を取るinterpret a passage out of context; quote out of context