tricks of the trade
US /trɪks əv ðə treɪd/
UK /trɪks əv ðə treɪd/

1.
商売の秘訣, 業界の裏技
clever methods or special techniques used by people in a particular profession or activity, often not widely known
:
•
He learned all the tricks of the trade from his mentor.
彼は師匠から商売の秘訣をすべて学んだ。
•
Knowing the tricks of the trade can save you a lot of time.
商売の秘訣を知っていれば、多くの時間を節約できる。