A primary occupation would be a "day job" or the one job worked by an individual that brings the most income. For instance, if a person worked 40 hours week at $15/hour at a factory job then worked an additional 20 hours a week as a cashier at a store, the person's primary occupation would be "factory worker".
Barack Obamas ocupation after finishing college was a attorney
Accountant
Four
barber
She's a singer
he was a uniocorn
Kraft scientist
He is her manager.
chef, cook
being a prophet of God
Miley's occupation is a singer
A carpenter has the occpation to work with wood.