In this wiki you can collaboratively create and edit pages and sub-pages to create a project wiki.

You can:

• Insert text and images, also with copy and paste from other documents
• Create a page hierarchy with parent pages
• Include wiki pages to the project menu
• Use macros to include, e.g. table of contents, work package lists, or Gantt charts
• Include wiki pages in other text fields, e.g. project overview page
• Include links to other documents
• View the change history
• View as Markdown

More information: https://www.openproject.org/docs/user-guide/wiki/