A place where all our ideas go to when they come up during the day. It helps us capture every thought that pops into our mind to keep our seven short-term memory slots free.
It should be friction-less to write something down like a small notebook or app.
The excerpts submitted here are more reminders than complete ideas. Therefore, they should be reviewed shortly after because raw ideas have an expiration.
At this point, we rewrite them into self-contained thoughts, connect them to existing ideas, and use them to create action items.
I use the same inbox that I use for GTD.