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” 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.
 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).