I already got the low down.
→ 기본적인 것은  알아.

[예문]
A: What’s wrong with your voice?
  목소리가 왜 그래?

B: I fell asleep with the window open last night. Now my throat is all scratchy.
  어제 밤에 창문 열어 놓고 잤어. 목이 완전 따가워.

A: You should gargle with salt water. Lemon and honey tea does wonders, too.
  소금물로 헹궈 내봐. 꿀차에 레몬타서 먹어도 좋아져.

B: I know.   I already got the low down from my mom. Thanks, though.
알아. 그런기본적인 것은  엄마로부터배웠어. 고마워.