いいかわからない

don't know what is best

→ 良い
phrase Rare #34,653
don't know what is best Used after a question word or verb phrase to say that you don't know what you should do or which option is right. The exact English translation depends on the preceding words.
JA: この問題をどう解けばいいかわからない。
EN: I don't know how to solve this problem.

誰に頼っていいかわからない

I don't know who I can turn to.

トムさんは誰に聞いていいかわからない

Tom doesn't know who to ask.

どうしていいかわからない

I don't know what to do.

どのボタンを押せばいいかわからない

I don't know which button to press.