A "Trick of the Trade" is actually a simple way to do something. They are tricks because they are not obvious to begin with

(1) Treading. To start threading correctly, it is required that both female and male threads are on the same axis, i.e., they line up. I have found that turning the thread backwards, unthreading, until a distinct click is found and then threading will start impossible to start threads.

(2) Plumbers do not fix old plumbing, they use a sawsall and cut the old out, and replace with new. The reason is that if they try to fix the old rotted piping, they will end up earning the huge amount of money they are going to charge you.

(3) The mystery of Life; The trick is to find it in the LIVING.

(4) The secret of LOVE. The trick is find it in the LOVING