The "Verify Content" utility will attempt to retrieve and render all content in your course (including any dependencies such as image files) and will report the retrieval status and rendering status of each item.
A retrieval status of "ok" means the file contents were successfully retrieved (including replication from the resource's home server, if required).
A render status of "ok" means that LON-CAPA was able to process the file contents to create the output which would be sent to the user's web browser (e.g., parsing XML for LON-CAPA problems, or HTML for web pages) without error.
In the case of an error, is displayed. Warnings in html pages will not affect your students' scores.