This is the 392nd most frequent French word.
fil
Thread.
Here, 'fil' is used to mean a physical thread or wire, specifically the one that connects electrical devices.
Le fil du chargeur est abîmé.
The cable of the charger is damaged.
In this sentence, 'fil' metaphorically refers to the progression or continuity of a story.
Suivez le fil de l'histoire pour mieux comprendre.
Follow the thread of the story to better understand.
Here, 'fil' denotes a taut wire or cord used in tightrope walking.