Can employment under Comprehensive Employment and Training Act CETA be counted as federal employment?

YES,

Only that there is job security assuming that this is a UK questions, otherwise self employment is always better as you can deduct things from tax

some are people can wok with an doctor who has already have there degree

An employment contract dictates the conditions of employment, such as salary, vacation, benefits, etc. An "at will" employee serves at the pleasure of the employer, meaning their employment can be...

An occupation that is provided by a manager/boss which a person earns a living; work; business.