Ask HN: What are examples of shared spreadsheets you use (if public link it)?

My wife and I share google sheets for grocery list. When one of us notices something we need we can add it and whoever goes to the store can get it.

Additional sheets contain lists of reference info, the size furnace filter we need, the model number of the filter for our water system, etc, to help us get the right one for stuff that isn't purchased much.