This is the 8754th most frequent Japanese word.
有益
Beneficial; useful.
The word '有益' is used as an adjective to describe '情報' (information) to mean 'beneficial' or 'useful'.
この本は理解が深まる有益な情報がたくさん含まれています。
This book contains a lot of beneficial information that deepens understanding.
Here, '有益' is used to qualify 'アドバイス' (advice), establishing that the advice had a positive, helpful nature.
有益なアドバイスをくれた友人に感謝しています。
I am grateful to my friend for the helpful advice they gave.
In this sentence, '有益' describes '経験' (experience), signifying that the experience likely adds value or provides benefits.