I tend to take notes in outline form using bulleted lists.
Bulleted lists, by default, are not necessarily an outline. In order to be an outline a bulleted list needs to use paragraph styles and have those styles associated with one of the ten levels in the outline facility (Tools > Outline Numbering…). Whether you make use of the provided Heading N paragraph styles or create your own custom styles (based on paragraph styles Text body or List N) is up to you. When modifying each paragraph style, use the Outline & Numbering tab to set the Outline level and Numbering Style for each e.g., “Level 1” and “List 1”[1] for the first level, “Level 2” and “List 2” for the second and so on. These styles will then show up in the Navigator under the “Headings” entry.
[1] Note that this is a reference to a list style and not a paragraph style. There are, by default, only five List N styles defined, so if your lists have more levels than this, you will need to define the further style (to define the type of bullet identifier).