Very generally speaking, it is any skill and relates to the job you are referring to. For instance, if you are applying for a job as a computer operator, the fact that you play the Trumpet is not a job skill, but the fact that you know how to use Excel probably is.
i have skill for this job
Public speaking
Queequeg's skill is harpooning; he is an expert harpooner, which secures him a job on the ship Pequod as a harpooner.
Maintenance man is a job skill. Managing finances is a skill. Ability to play the mandolin is a skill.
One needs a college or a university degree for a paralegal job. One also needs skills like people skill, listening skill, speaking skill and many more skills for a paralegal job.
a secretary
Graffiti!!!
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Skills needed to perform a certain kind of job.
skill in one kind work
Unfortunately, you can't change your job unless you try to level your skill for that other job ( e g. you choose a summoner and you decide to be a crafter, then you have to keep training on the crafting skill).
Communications