Renewals is on Plus and Premium. It holds the things that expire while you aren't looking: a license, an insurance policy, a passport, a domain name, a professional membership, a car registration.
Adding one
Give it a name, a category, the date it runs out, and how often it comes round. Yearly is the common one. Some things renew every two years and some are one-off, and one-off is a real choice rather than a way of saying you don't know.
If it costs money, put the cost in. Buhata weighs it by how often it repeats, so a yearly policy and a monthly subscription can sit in the same list without one of them lying about what it costs you.
When you're told
Three warnings: sixty days out, thirty days out, and seven days out. That first one exists because some things can't be done in a week. A passport is the obvious example.
Warnings show on the day card and on the calendar, and they stop once you mark the thing renewed.
Marking it renewed
Press "Renewed it" and the next date is worked out from the date it was due, not from the day you pressed it. That matters more than it sounds. If a policy falls due on the 28th of February and you renew it in March, the next one is still the 28th of February. Counting forward from the day you happened to act is how a date drifts a fortnight over a decade.
What it doesn't do
It doesn't renew anything for you, and it will never ask for a card or a login for the company involved. It tells you, in time, and the doing is yours.