How to Say "main section" in Spanish
The Spanish word for “main section” is “cuerpo” — B1 level.
English → SpanishB1
NounB1
The central part of anything

Examples
El cuerpo del artículo explica la idea principal.
The body of the article explains the main idea.
El cuerpo de la guitarra es de madera de arce.
The body of the guitar is made of maple wood.
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