If this helps, it's designed for unstructured information storage, so fundamentally you use it as you'd use a notebook with the exception that organisation is something you can do ad-hoc. For example ...

In an update to its support document, Microsoft plans to reduce the performance of its legacy OneNote app in an attempt to encourage users to use the Windows 11 OneNote app. Windows Latest first ...

Microsoft announced a pair of new features for OneNote this week: Copilot Notebooks and Dynamic DPI support. The former is a larger addition that brings the power of AI and Microsoft 365 Copilot to ...