This is the 3152nd most frequent Japanese word.
努める
To strive; to make an effort.
Here, '努める' is used to indicate personal effort and striving towards a goal.
私は毎日目標に向かって努めています。
I strive towards my goals every day.
In this case, '努める' conveys directed effort towards achieving a collective objective.
彼はチームの成功のために努めました。
He exerted effort for the team's success.
Here, '努める' is being used to express trying or exerting effort to accomplish an improvement in personal habits.