This is the 10348th most frequent Turkish word.
bilmediğimiz
"Bilmediğimiz" means "that we do not know."
Here, 'bilmediğimiz' is used as an adjective clause meaning 'that we do not know', modifying 'şeyler' (things).
Bilmediğimiz şeyler hakkında konuşmamalıyız.
We should not talk about things we do not know about.
In this sentence, 'bilmediğimiz' describes 'yerlerde' (places), indicating unfamiliar locations.
Bilmediğimiz yerlerde dikkatli olmalıyız.
We should be cautious in places we do not know.
Here, 'bilmediğimiz' is used as an attribute to 'bir soru' (a question), referring to a question that is unknown to us.