Use a brain when a thought has a home
A brain is useful for a project, area, or topic that you expect to return to. You can rename brains, give them colors and emoji, nest them up to three levels, and choose a default brain. Inbox cannot be removed.Use a tag when a thought belongs to a pattern
Tags live directly in the text. Type# and choose an existing tag or create a new one.
A single thought can naturally connect to several ideas without moving it between folders.
Example
Review launch plan with @Jordan #decision #q4
That thought can live in a Work brain while still showing up anywhere you filter for #decision or #q4.