What makes the difference ::: ما الذي يصنع الفارق

In Arabic:

العبرة: الجهد مهم، لكن الأهم هو معرفة أين تبذل الجهد، و هذا ما يصنع الفرق في الحياة،

In English:

This story is inspired from fantasy:

A ship's engine crashes, and all technical staff of the ship were unable to identify the cause of the crash and therefore were unable to repair it.
The owner of the ship used an old man known for repairing ships since he was a young man,
The old man came with his tool bag and then began to examine the engine carefully and meticulously. The crew of the ship watched him closely to see how he would fix the engine,
After the man finished the examination, he took a hammer from his bag and hit a certain place on the engine.
After a while he sent the repair bill to the ship owner and it was ten thousand dollars. The owner was surprised by the amount, the old man did nothing, he just hammered the engine and is asking ten thousand dollars for that, then the owner asked for detailed bill then the old man sent him the following invoice:
hammering ................................................. 2.00 $
locate the place must be hammered ............... 9998.00 $

the point is : effort is important, but the most important is to know where to make effort, and this is what makes the difference in life