な-adjectives
describing words that take な before a noun
な-adjective + な + Noun / な-adjective + です
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な-adjectives behave like nouns: at the end of a sentence they take だ or です (静かです, "it's quiet"), and their negative and past are the noun ones: 静かじゃない, 静かでした.
Before a noun they need な: 静かな町, "a quiet town"; 有名な人, "a famous person". That な is what gives them their name.
Most don't end in い, but a few that do are traps: きれい (pretty, clean), 嫌い (disliked) and 有名 are な-adjectives, so it's きれいな花, not きれい花, and きれいじゃない, not きれくない.
Common ones at N5: 静か, 元気, 有名, 好き, 嫌い, 上手, 下手, 便利, 簡単, 暇, きれい.
Examples
静かな町に住んでいます。
I live in a quiet town.
あの人は有名な歌手です。
That person is a famous singer.
きれいな花ですね。
What beautiful flowers.
これは便利なアプリです。
This is a handy app.
元気な子どもたちが走っています。
Lively children are running around.