のが一番いい

it's best to

→ の
phrase Rare #22,184
it's best to Follows a verb in its plain form to say that doing something is the best option. 一番いい means "the best" or "best."
JA: 早く寝るのが一番いい。
EN: It's best to go to bed early.

これらの手紙に関しては燃やしてしまうのが一番いいと思う

As for these letters, I think it would be best to burn them.

歩くのが一番いい運動

Walking is the best exercise.

そのことについて何も言わないのが一番いいと思った

I thought it would be best not to say anything about it.

私と行くのが一番いいだろう

You'd be best off going with me.

それは触れないでおくのが一番いい

It’s best not to bring that up.

この場合どうするのが一番いいんだろう

What would be the best thing to do in this situation?