What is the origin of the idiom "old hand" and when to use it?

The idiom "old hand" has origins that trace back to the 19th century. It is believed to have originated in the context of card games, particularly poker or similar gambling games. In these games, experienced players who were skilled and knowledgeable were referred to as "old hands." These individuals were seen as having a wealth of experience and expertise, making them formidable opponents. This expression is an idiomatic expression used to describe someone who is highly experienced, skilled, or knowledgeable in a particular field, activity, or job. It signifies a person who has been doing something for a long time and has acquired significant expertise and competence.