How to write Dad's business occupation?

Dad is in business, and his position is "freelancer".

Freelancers find their own jobs under their own guidance, and their aliases are also called consultants, temporary workers, self-employed, contract workers, free agents, solo artists, solo workers, people who work by telephone, telecom operators (people who are proficient in electronic products, especially in Europe), virtual employees and virtual entrepreneurs (very popular).

The occupations of freelancers mainly include:

The first category is small businessmen, such as tobacco and alcohol grocery store owners, stationery and toy store owners, decoration company owners, online shop owners of shopping networks and so on.

The second category is salesmen without basic salary, such as life insurance consultants, real estate agents, advertising agents, direct sellers and so on.

The third category is professionals, such as photographers, patent agents, lawyers, accountants, dentists, technical consultants, management consultants, plumbers, electricians, hairdressers and artists.