Here's a breakdown:
* Knack: A natural talent or ability for doing something.
* For: Indicates the specific thing someone has a knack for.
Examples:
* "She has a knack for making people feel comfortable."
* "He has a knack for remembering names."
* "My brother has a knack for fixing anything."
* "The artist has a knack for capturing the essence of her subjects."
Similar Idioms:
* Have a gift for
* Have a talent for
* Be good at
* Be adept at
Essentially, "have a knack for" implies a natural, effortless skill that makes someone stand out or excel in a particular area.