How would you use Excel/Spreadsheet software to manage a medieval Kingdom and Business?

Basically Isekai/Time-Travel/etc.

You have computers, smartphones, etc and solar panels and can buy more based on achievement points awarded for good management of the Kingdom using a mysterious system.

What could you use it for? What features will be most useful? What challenges will you face? Huge painpoints in Medieval book keeping and administration that can be fixed with Excel and so on.

Same for Medieval Business too.

I think this should be a good thought exercise/experiment. Will make you look at Excel from another worldview.

Inspired by Ideal Sponger Wife where MC uses spreadsheets in Isekai even though it's pretty basic.