This is the 8894th most frequent Polish word.
sekretach
"Secrets" (in locative/plural form).
The word 'sekretach' in this sentence is used to refer to secrets (plural and in the locative case) that are topics of discussion.
Rozmawialiśmy o różnych sekretach z przeszłości.
We talked about various secrets from the past.
Here, 'sekretach' describes secrets (plural, locative case) that are associated with the forest, indicating mystical or unknown aspects.
Książka opowiada o sekretach lasu.
The book tells about the secrets of the forest.
In this instance, 'sekretach' refers to secrets (plural, locative case) belonging to the main character, emphasizing personal and private matters.