Meaning of いいこと in Japanese

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Definition of いいこと

いいこと(iikoto) 【いい事 ·好い事 ·良い事】

This is definitely, 'The good you do for others is good you do yourself'! It's a reward because I was helpful!

What the fuck are you up to taking advantage of his proximity to cling to him like a wet T-shirt?!

どこであれ道路どうろを横切るよこぎる時ときに右左みぎひだりを見るみるというのはいいことだ。

It's a good rule to look both ways before you cross the street anywhere.

A foolish impulse made me say what I should have left unsaid.

これにはもう一つもうひとついいことがあった。

But I had another advantage in it.

I know you don't care.

いまは時間じかんが手中しゅちゅうにあるのだから、何かいいことをしようする。

With time on our hands now, let's do some good.

いいこと聞いたわ。それって勉強べんきょうになったわ。

I learned a lot from what I heard.

いいことを教えてやる。

I'll tell you a secret.

I like the sound of what he says, but it IS just talk, you know.