Write everything down. Sort it after.
A brain dump does not need a structure at the start. Put each thought on its own line, then arrange the lines once you can see what is there.
Capture one thought per line
Press Enter whenever the subject changes. Short lines are easier to move and group later.
Group the lines that belong together
Move related items next to one another. Add a heading, then indent the details beneath it.
Mark actions without rewriting the note
Turn actionable lines into checklist items. Keep reference notes as bullets, and focus on one branch when you want to work through it.
Turn a brain dump into an outline
Start with unfiltered lines in Jotfold. Add headings and indentation when you are ready.