We have a family gmail address. So, there's a shared Google Keep for info and a drive for anything family - car and house insurance docs, holiday docs, CVs etc. I suppose they're not family for a lot of people, and we're four adults now, but they still send me anything that needs proof reading.
In the Google Drive, there's a folder called manuals, and every time we buy something, I download the manual and file it in Manuals>Kitchen or Manuals>Tech or whatever.
We also have a family calendar that we can all see/add to and the email address is used when booking a holiday, broadband etc that we all might need to check. Obviously, we all have personal and work email addresses, but we all have the family one on our phones and it's only used for something that isn't personal.
It's taken a while to get everyone to use it, but we regularly say, thank goodness we have it.