Page-level permissions in Google Sites allows the creator of a site to share and grant collaborators editing access to specific pages within a site rather than giving collaborators access to edit the entire site. To use page-level permissions open your Google Site editor then click “enable page-level permissions.” With page-level permissions activated you can share and allow editing for each page individually. In the video embedded below I demonstrate how to enable page level permissions in Google Sites.

Applications for Education
As I mentioned in the video, using page-level permissions is a good way to use Google Sites as a digital portfolio for your students. Give each student access to edit just the page that is assigned to him or her.