A good idea would be if someone would make an add-on for home finance, a maked a program for android!
You can always sync your Gnucash or Quickbooks or whatever other files with Nextcloud, but otherwise I can’t see how finance falls within the scope of Nextcloud at all.
If you want to give it a crack, start here: https://docs.nextcloud.com/server/12/developer_manual/app/startapp.html
But the world of finance is more complicated than it seems…
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