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 ...

If you’re looking to enhance your note-taking and boost your productivity, Microsoft OneNote is a tool that can help you achieve just that. This versatile application is designed to cater to the needs ...

Microsoft OneNote is a popular platform that you can use to organize thoughts, jot down ideas, and collaborate seamlessly. Like most Microsoft Office 365 apps and other digital notebooks, project ...

NEW HOME TAB Microsoft has debuted a new Home tab experience in OneNote on iOS that's designed to enhance the navigation and also lets users create notes easily. ON THAT NOTE Microsoft is working ...