Questions & Answers about Jeg forstår holdningen bedre, når hun forklarer den roligt.
Holdningen is the definite form, meaning the attitude / the opinion / the stance rather than an attitude.
In Danish, the definite article is usually attached to the end of the noun:
- en holdning = an attitude, an opinion
- holdningen = the attitude, the opinion
So this sentence is talking about a specific attitude that is already known from the context.
Den refers back to holdningen.
So instead of repeating the noun, Danish uses an object pronoun:
- holdningen = the attitude/opinion
- den = it
This is very similar to English:
- I understand the attitude better when she explains it calmly.
Because holdning is a common-gender noun, the pronoun is den, not det.
Danish nouns belong to one of two grammatical genders:
- common gender → usually takes en and later den
- neuter gender → usually takes et and later det
Holdning is a common-gender noun:
- en holdning
- holdningen
- den
So den is the correct pronoun.