Keywords: experience, familiarity, skill, experienced, familiar, skilled
As a Noun
The know-how a person has at a particular job or task because they have done it for a long time. English = experience, familiarity.
The knowledge and ability that enables you to do something well. English = skill.
As a Verb or Adjective
To have a lot of know how and familiarity with a job or task because you have done it for a long time. English = (be) experienced, (be) familiar with.
To have the knowledge and ability to do something well which you acquire through training and experience. English = (be) skilled.