When a team site is created, a shared OneNote notebook is automatically created as part of the site. You can use this notebook to capture, compile, and share minutes, thoughts, and ideas with your teammates.
Sign in to Office 365 with your work or school account, and then navigate to your team site (In the app launcher , click Sites, and then locate your team site).
In Quick Launch (the navigation links on the side or top of the page), click Notebook.
Tip: If for some reason the link is removed, you can locate the notebook in the Site Assets library (In the Quick Launch, click Site Contents, and the click Site Assets).
Alternatively, to open your team site notebook from OneNote, near the top of the page, click the name of your current notebook, and then locate the team site notebook from the list.
A sample list of notebooks from OneNote Online
Edit the notebook and organize it by adding sections as you see fit. For example:
Sample sections that contain collected notes
Tip: Use the OneNote page templates feature to guide you in designing pages. For more information, see Create or customize a page template in OneNote.
For more information on how to use OneNote, see OneNote 2016 Training.