Good
い adjective
This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of good? It's also good.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you to remember:
A good way to pass the time is with a yo-yo (よ). But it better be a good yo-yo. A bad one will just fall apart.
Note that よい is a more formal or literary way of saying "good," the more common one being いい. To distinguish the different readings, the latter version is usually written in just kana too!
そのアイディアすごい良いですね！
I think that idea is very good!
ケンカするほど仲が良いって言うだろ？
You say you're getting along well as you fight, right?
良い考えだけど、実際それをするには資金が足りないんだよね。
It's a good idea, but we don't have enough money to do it.