This is the 895th most frequent Japanese word.
変え
"Change" or "alteration."
Using 変える to indicate modifying or altering a plan.
今日の計画を変える必要があります。
We need to change today's plan.
Using 変えなければ to express the necessity of changing an awareness.
環境問題に対して意識を変えなければなりません。
We must change our awareness towards environmental issues.
Using 変えて to describe altering one's behavior in a transformational way.