What is the difference between knowledge management and content management?
Content management typically refers to systems that collate and/or publish the various sorts of documents and other content an organization produces as part of its work. Blogging software like Wordpress, for example, counts as a Content Management Solution (CMS).
Knowledge management is a slightly more abstract discipline built around the concept of quantifying and systematizing the way in which an organization identifies, vets and adopts new business insights and best practices. The sort of materials KM entails is extremely diverse, anything from after action reports to company wikis to mentor-apprentice learning practices fall under the category of KM.
You can find a detailed knowledge management vs. content management breakdown right here.
I hope this helps!