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

1.
trucs du métier, ficelles du métier
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.
Il a appris tous les trucs du métier de son mentor.
•
Knowing the tricks of the trade can save you a lot of time.
Connaître les trucs du métier peut vous faire gagner beaucoup de temps.