Who is the three thousand worries? Is it Li Bai? What are the allusions?

Three thousand troubled hairs are the hairs on your fingers. This is a Buddhist term. Buddhism is the origin of a person's troubles, requiring people to become monks and avoid the world. It's about giving up the dust and shaving your head to show your ambition. Shaving your hair is becoming a monk and getting rid of your troubles. Therefore, hair is three thousand troubles.