The page they use
A handful of people open it. It can be public, or private to the people you give it to.
Use cases
Small software
A tiny product can have a tiny home. The tool you run for a few customers, on a link that stays up, with a place for their data.
The rows the product keeps
Accounts, orders, notes, whatever the product has to remember. Those rows live in a Table.
Start with one link
Ship the first version. Add the next piece when someone is actually using it.