Notion Second Brain Template: Build One Free With 4 Databases

A second brain in Notion needs four databases, not forty. This page is the whole build, free: what goes in each database, the rule each one follows when it's empty, an 8-step starter checklist, a 15-minute weekly review, and the four opinions that keep the system alive past week 3. The full pack behind it runs a different job (habits, meals, money, goals), and costs. This page alone is enough to build the second brain.

The Structure: 4 Databases, One Page

Every item in your workspace lives in exactly one of four places. That's the entire system; the rest of this page is making it stick. You'll see variations of this structure everywhere, sold under different method names. The bucket names below are generic on purpose: rename them to whatever you'll actually type.

Database	What goes in	When-empty rule
Inbox	Everything unsorted: an idea, a link, a bill to file, a book someone mentioned. Capture first, decide later.	Empty means you processed it, which is the goal. If it stays empty for days, you're capturing somewhere else; fix the capture habit, not the inbox.
Projects	Anything with an end: finish the portfolio, renew the passport, plan the trip. Each row gets a next step and a due date, or it isn't a project yet.	Empty means everything you started is finished. Start one thing this week or enjoy the calm; don't invent fake projects to fill the view.
Areas	What you maintain with no finish line: money, health, home, work, the people you keep in touch with. One row per ongoing responsibility.	Empty means you've been running on Projects alone. That works for a month and rots after; name what you maintain and it stops surprising you.
Archive	Done projects, dropped ideas, old everything. Nothing here needs action, ever. Search finds it when you want it.	Empty means you delete instead of archiving. That works until the first "wait, where did that go" moment; the archive is the delete button that doesn't scare you.

Why four works: capture has one door (Inbox), doing has one door (Projects), maintaining has one door (Areas), and letting go has one door (Archive). The moment a fifth door appears, you start deciding where things go instead of putting them somewhere.

Build It: an 8-Step Starter Checklist

One sitting, about 30 minutes on the free Notion plan. Check these off in order:

Create a page called Second Brain. One page, near the top of the sidebar, nothing nested inside it yet.
Create the four full-page databases: Inbox, Projects, Areas, Archive.
Add the same two properties to Projects and Areas: Status (Select: Active, Waiting, Done) and Next step (Text).
Add one more property to Projects: Due (Date).
Put all four on the Second Brain page as linked views, Inbox at the top, in that order.
Set the views: Inbox as a list, Projects as a board grouped by Status, Areas as a list, Archive as a list sorted by newest first.
Seed it with three real things: one open project with a next step, one area you actually maintain, one thing you want to read later in the Inbox.
Stop here. No icons, no covers, no template gallery, no fifth database until a real week proves you need one.

The Weekly Review: 4 Steps, 15 Minutes

The structure survives on one appointment: 15 minutes, same day every week, Sunday works for most people. Four steps:

Empty the Inbox. Every item moves to Projects, Areas, or Archive, or gets deleted. Nothing stays in the Inbox after review; it's a counter, not a shelf.
Walk Projects. Each row gets a next step written in, or moves to Archive if it's done or dead. A project without a next step is a wish; give it one or archive it.
Glance Areas. One line per area: still fine, or needs a task? Add the task if something nags. Areas don't need more than that.
Do nothing to Archive. It asks nothing of you. That's the point of it.

Week 6 looks like week 1 as long as the review happens. The weeks it doesn't happen are the weeks the Inbox fills and the system quietly dies, so guard the appointment, not the databases.

Four Opinions Worth Keeping

Labeled as opinions, from building and abandoning a few of these:

One inbox, not five. Notion's web clipper, mobile quick-capture, and email-to-page will each happily become a second inbox. Every extra inbox doubles the places you have to empty on Sunday. Point every capture at the one Inbox page, or type it in by hand.
If a property needs a paragraph to explain, delete it. Status and Next step carry Projects; Due carries dates. Priority scores, effort estimates, and relation webs come back later if a real week demands them. They rarely do.
Archive faster than feels right. A second brain rots from keeping too much, not too little. Search finds anything you archived; guilt finds nothing you hoarded in Projects.
Build it in one sitting and change nothing for 30 days. The week-3 redesign is how these systems die. The structure above survives because there's nothing in it to redesign; resist the urge to improve a system you've used four times.

What the Full Pack Adds (and What It Doesn't)

The four databases above catch what lands. The paid pack runs the week: Life OS Lite for Notion ships five import-ready CSVs with demo data plus a 30-minute setup guide. Per its own README:

5 CSVs: habits.csv (8 habits across 7 categories with a week already ticked), meals.csv (14 meals whose ingredients map to a Groceries relation), budget.csv (12 categories showing one real month, over-spent eating-out line included), goals.csv (6 goals with one quarterly milestone each), and log.csv (10 books, shows and courses with ratings and takeaways).
The guide (setup.md): import order, property types listed one by one, and four paste-ready formulas written out in full (weekly habit score, target check, budget Left and Status, milestone days-left).
Free plan is enough: no paid-plan features, no API tokens, no third-party apps, no subscriptions. Import needs the desktop app or browser; the mobile app can't import CSVs.
License: personal and commercial use allowed, as many copies as you like. No resale of the pack itself.

One thing to be clear about: the pack does not contain the Inbox/Projects/Areas/Archive structure from this page. Its five databases are the running-the-week side (habits, meals, budget, goals, log). Build the second brain above for free from this guide, then add the pack if you also want the week running itself.

The honest note on cheap and simple: the price and the five-database scope are the design choice, not a compromise. A pack you import in about 10 minutes and still use in month 3 beats an elaborate one you abandon in week 2; the same rule as the second brain above, applied to money.

Limits, stated plainly: the formulas follow Notion's current formula 2.0 syntax and were checked by hand, but were not executed in a live Notion workspace; the guide's troubleshooting section covers the common failures (text-typed numbers, date parsing, relation pasting). Sample rows come from one demo setup. This pack works with Notion but is unaffiliated with and not endorsed by Notion; "Notion" names the app the databases import into, nothing more.

If you run your notes in plain markdown instead, the same four-bucket idea as folders is the Obsidian second brain template (six numbered folders, no plugins), and the capture-and-process habit behind all of this is on the printable second brain setup checklist.

Get Life OS Lite for Notion - 5 import-ready CSVs + 30-minute guide →

one-time · 5 CSVs + setup guide · works on the free Notion plan · instant download