Content strategy refers to the planning, development, and management of content—written or in other media. The term has been particularly common in web development since the late 1990s. It is a recognized field in user experience design, and it also draws from adjacent disciplines such as information architecture, content management, business analysis, digital marketing, and technical communication.
https://en.wikipedia.org/wiki/Content_strategy
Also see: https://gilbane.com/category/content-management-strategy/
The term has also been adopted by the content marketing movement.