How to Say "insides" in Spanish
The Spanish word for “insides” is “entraña” — B2 level.

Examples
El minero trabajaba en las entrañas de la tierra.
The miner worked in the depths of the earth.
Sintió un dolor profundo en las entrañas.
He felt a deep pain in his guts.
Esta película muestra las entrañas de la industria musical.
This movie shows the inner workings (the insides) of the music industry.
Singular vs. Plural
When talking about physical organs or anatomy, it is almost always plural ('entrañas'). When talking about the heart or core of a single concept, you might see it in singular.
Not just for humans
You can use this word for anything that has an 'inside,' like a mountain, a city, or even a computer system.
Don't confuse with 'strange'
Mistake: “Esa es una persona entraña.”
Correction: Esa es una persona extraña. 'Entraña' refers to the inside of something, while 'extraña' means strange or weird.
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