This is the 3264th most frequent Russian word.
опасностями
"Dangers" or "hazards."
The word "опасностями" is used in instrumental plural form to indicate that the forest is filled with various dangers.
Лес был полон опасностей, и мы двигались медленно.
The forest was full of dangers, and we moved slowly.
Here, "опасностями" is used to describe the various dangers confronted due to inexperience in an instrumental plural form.
Неопытность человека часто сталкивается с опасностями, которые можно было бы избежать.
A person's inexperience often faces dangers that could have been avoided.
In this sentence, "опасностями" describes the challenges that individuals need to overcome, again in instrumental plural form.