This video shows you how to share notes in OneNote so that you can collaborate. Here are the steps outlined in the video 1) Select Share, 2) Type an email address, 3) Select Share, 4) Show or hide authors' initials

Follow the step-by-step instructions in this article: https://support.office.com/en-us/article/share-a-page-of-notes-or-an-entire-notebook-from-onenote-for-windows-10-d4a74a14-44a3-411e-8fb5-06e73ddf047f