Good; excellent; pleasant — a positive evaluation (commonly said as いい in spoken Japanese).
今日は天気が良いから散歩に行こう。
The weather is good today, so let's go for a walk.
彼女はとても良い友達だ。
She is a very good friend.
その案は良いと思います。
I think that idea is good.
頭が良い人は問題解決が早い。
Smart people solve problems quickly.
Sufficient; enough; ready — used to indicate adequacy (e.g., 'Is this good enough?').
これで良いですか？全部揃いました。
Is this all right? Everything is ready.
資料はこれで良ければ、送ってください。
If these materials are sufficient, please send them.
準備は良いか、もう一度確認しよう。
Are we ready? Let's check once more.
Profitable or beneficial — used for deals, offers, or situations that are advantageous.
その投資は会社にとって良い結果をもたらした。
That investment brought favorable results to the company.
今のうちに買うのが良いかもしれない。
It might be advantageous to buy now.
OK; all right; indicates permission or that something is acceptable (e.g., 'you may do ~').
ここに座っても良いですか？
May I sit here?
そのままにしておいて良いよ。
You can leave it as it is.
明日まで待っても良いでしょうか？
Would it be all right to wait until tomorrow?
As a suffix attaching to the masu-stem of verbs to mean 'easy to ~' or 'suitable for ~'. Note: in modern Japanese, 〜やすい is more commonly used.
扱い良い素材は初心者にも向いている（現代語では『扱いやすい』と言うことが多い）。
Materials that are easy to handle suit beginners (in modern language we often say '扱いやすい').
持ち歩き良いサイズのバッグを選んだ。
I chose a bag that's a convenient size to carry around.