The tricks of the trade
Definition 1 of 1
Pro Tip 1/3Workplace Insights
The phrase often refers to practical knowledge in a job that's not taught in textbooks. 
He showed me some tricks of the trade to save time on the construction site.
Pro Tip 2/3Not Deceptive
Despite 'tricks' suggesting deceit, the phrase usually means clever, honest techniques. 
Knowing the tricks of the trade can make you a great chef.
Pro Tip 3/3Experienced Insight
The phrase implies that someone has gained wisdom through experience in a field. 
The old fisherman taught me the tricks of the trade to find the best catch.