為る
する · suru · JLPT N3 · verb-suru
to do
🛠️ suru sounds like sure: Sure, I'll do it!
する is Japanese's all-purpose doing verb. Add it to a noun to make an action: 勉強する (study + do) means to study. It is almost always written in kana; the kanji 為 carries the old sense of act or for the sake of.
なる · naru · JLPT N3 · verb-suru
to change
🐛🦋 為 = do, act; なる = become: what you do is what you turn into
The kanji 為 means doing or acting, as in 行為 (an act). As なる it means to become, to turn into, or to reach a point. Everyday Japanese usually writes it in kana, as なる, rather than with the kanji.