Areas
As Tiago Forte describes, Areas are your various roles and responsibilities in life, such as Health, Relationships, and Finance.
Topics
Use Topics to tag your Notes and References to specific subjects of interest or sub-areas. This allows for a more detailed organization than Areas.
Projects
Plan and track your projects and the series of tasks necessary for the completion of a project, keeping informed of the deadlines and progress.
Tasks
Tasks are single, actionable items that help you advance a project or goal or the objective of the task itself.
Notes
Notes are categorized into Fleeting, Literature, Project, and Permanent types, inspired by the Zettelkasten method. Fleeting and Literature Notes can be turned into Permanent Notes; otherwise, they will eventually be archived along with your Project Notes after use.
Notebooks
This is an additional method for grouping your Notes, apart from Topics. The key difference is that Notebooks are used exclusively for Notes and not for References, allowing for a narrower organization.
References
These are sources of information, such as books, videos, podcasts, or movies, that you have interacted with. You can create new Notes from these References and or link References to relevant projects and goals.
Highlights
These are verbatim quotes from your References or an individual, serving as memorable points you can recall when browsing through your References or Topics.