rpgherogazさん
はじめまして。JPOD101のスタッフのキャットです。よろしくお願いします。
About your question. I think it'll be most useful if I give you some sample sentences to illustrate the differences between these three words.
変更 ("change, modification", noun)
パソコンで変更を保存しました。
I saved my changes on the computer.
変わる ("to change, to be transformed", verb)
彼の話を聞いてから、気が変わりました。
I changed my mind after listening to what he had to say.
変化 ("change, variation", noun)
日本の社会は変化しつつあります。
Japanese society is changing.
I hope that helps
If there's anything still unclear, please ask me:!: