To qualify for a green card through employment you must have the correct background in terms of experience, training, and education for the job you have been offered.
For example, if you are a qualified nuclear scientist, but are offered a job managing a U.S. bakery, you cannot use that job offer to get a green card, because you have no background in bakery management.
To qualify for a green card through employment you must have the correct background in terms of experience, training, and education for the job you have been offered.