figure out what to do

You can't tell anyone, not until I figure out what to do. / Ты не должен никому говорить, по крайней мере до тех пор, пока я не придумаю, что делать.

Can you understand that at all?

I get the point.

I got the point.

I learned something today.

It's important for you to understand.

I can't figure out what I ever saw in him.

I finally understand.

This stuff is hard to understand.

You wouldn't understand.

- Tell me about what happened. / Расскажи мне, что произошло.

- There's no point telling you. You wouldn't understand. / Нет смысла тебе говорить. Ты все равно не поймешь.

learn one's lesson

learn a lesson

Alright, I'm back. I hope you've learned your lesson. / Ну хорошо, я вернулся. Надеюсь, ты намотал себе на ус.