The three approaches
PARA (Projects, Areas, Resources, Archives) organizes everything by how actionable it is — great for people who think in projects and want a clean, practical filing system. Zettelkasten builds knowledge as a network of small, linked notes — ideal for writers and researchers who want ideas to collide and compound.
A visual, spatial system puts your notes on an infinite canvas where layout and proximity carry meaning — the best fit for visual thinkers who organize by where things are, not what folder they're in.
Why the right method matters
The best system is the one you'll actually keep using. Force yourself into a method that fights your instincts and you'll abandon it in a month. Match the method to your natural style and capturing, organizing, and recalling start to feel effortless — which is the whole point of a second brain.