If something happens tomorrow, could someone else find the insurance policy, reach your doctor, cancel the phone contract and feed the dog? Most of that lives in one person's head. This is where you put it on paper.
It is an organiser, not a legal document. It records where things are and under which number — not passwords, not a will, not legal advice. The first page of the binder says so, and says what to keep in a safe or with a notary instead.
Seventeen pages, undated, in A4 and US Letter. Fill in what applies, skip the rest, and keep it in a ring binder somewhere your family knows to look.

Book tracker for Excel and Google Sheets: 500-book log, dashboard with reading goal and charts, series tracker, TBR list, reading challenge and habit tracker.

Printable and fillable 2027 calendar: Sunday start with US holidays or Monday start with week numbers, US Letter and A4.

Snowball and avalanche side by side — it tells you which method is cheaper for your debts.